diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index 78a78f32a7a..54adce03e3b 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -2133,9 +2133,10 @@ class assign {
      * This means the submission modification time is more recent than the
      * grading modification time and the status is SUBMITTED.
      *
+     * @param mixed $currentgroup int|null the group for counting (if null the function will determine it)
      * @return int number of matching submissions
      */
-    public function count_submissions_need_grading() {
+    public function count_submissions_need_grading($currentgroup = null) {
         global $DB;
 
         if ($this->get_instance()->teamsubmission) {
@@ -2143,7 +2144,9 @@ class assign {
             return 0;
         }
 
-        $currentgroup = groups_get_activity_group($this->get_course_module(), true);
+        if ($currentgroup === null) {
+            $currentgroup = groups_get_activity_group($this->get_course_module(), true);
+        }
         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, true);
 
         $params['assignid'] = $this->get_instance()->id;
@@ -2250,12 +2253,15 @@ class assign {
      * Load a count of submissions with a specified status.
      *
      * @param string $status The submission status - should match one of the constants
+     * @param mixed $currentgroup int|null the group for counting (if null the function will determine it)
      * @return int number of matching submissions
      */
-    public function count_submissions_with_status($status) {
+    public function count_submissions_with_status($status, $currentgroup = null) {
         global $DB;
 
-        $currentgroup = groups_get_activity_group($this->get_course_module(), true);
+        if ($currentgroup === null) {
+            $currentgroup = groups_get_activity_group($this->get_course_module(), true);
+        }
         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, true);
 
         $params['assignid'] = $this->get_instance()->id;
@@ -5322,13 +5328,13 @@ class assign {
 
             $summary = new assign_grading_summary($this->count_teams($activitygroup),
                                                   $instance->submissiondrafts,
-                                                  $this->count_submissions_with_status($draft),
+                                                  $this->count_submissions_with_status($draft, $activitygroup),
                                                   $this->is_any_submission_plugin_enabled(),
-                                                  $this->count_submissions_with_status($submitted),
+                                                  $this->count_submissions_with_status($submitted, $activitygroup),
                                                   $instance->cutoffdate,
                                                   $instance->duedate,
                                                   $this->get_course_module()->id,
-                                                  $this->count_submissions_need_grading(),
+                                                  $this->count_submissions_need_grading($activitygroup),
                                                   $instance->teamsubmission,
                                                   $warnofungroupedusers,
                                                   $this->can_grade());
@@ -5337,13 +5343,13 @@ class assign {
             $countparticipants = $this->count_participants($activitygroup);
             $summary = new assign_grading_summary($countparticipants,
                                                   $instance->submissiondrafts,
-                                                  $this->count_submissions_with_status($draft),
+                                                  $this->count_submissions_with_status($draft, $activitygroup),
                                                   $this->is_any_submission_plugin_enabled(),
-                                                  $this->count_submissions_with_status($submitted),
+                                                  $this->count_submissions_with_status($submitted, $activitygroup),
                                                   $instance->cutoffdate,
                                                   $instance->duedate,
                                                   $this->get_course_module()->id,
-                                                  $this->count_submissions_need_grading(),
+                                                  $this->count_submissions_need_grading($activitygroup),
                                                   $instance->teamsubmission,
                                                   false,
                                                   $this->can_grade());
diff --git a/mod/assign/tests/externallib_test.php b/mod/assign/tests/externallib_test.php
index 8f6b82021ce..1e9923eb367 100644
--- a/mod/assign/tests/externallib_test.php
+++ b/mod/assign/tests/externallib_test.php
@@ -2021,8 +2021,9 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
         $this->assertEquals(1, $result['gradingsummary']['participantcount']);
         $this->assertEquals(0, $result['gradingsummary']['submissiondraftscount']);
         $this->assertEquals(1, $result['gradingsummary']['submissionsenabled']);
-        $this->assertEquals(1, $result['gradingsummary']['submissionssubmittedcount']);
-        $this->assertEquals(1, $result['gradingsummary']['submissionsneedgradingcount']);
+        $this->assertEquals(0, $result['gradingsummary']['submissiondraftscount']);
+        $this->assertEquals(1, $result['gradingsummary']['submissionssubmittedcount']);  // One student from G1 submitted.
+        $this->assertEquals(1, $result['gradingsummary']['submissionsneedgradingcount']);    // One student from G1 submitted.
         $this->assertFalse($result['gradingsummary']['warnofungroupedusers']);
 
         // Second group.
@@ -2030,12 +2031,28 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
         $result = external_api::clean_returnvalue(mod_assign_external::get_submission_status_returns(), $result);
         $this->assertCount(0, $result['warnings']);
         $this->assertEquals(1, $result['gradingsummary']['participantcount']);
+        $this->assertEquals(0, $result['gradingsummary']['submissionssubmittedcount']); // G2 students didn't submit yet.
+        $this->assertEquals(0, $result['gradingsummary']['submissionsneedgradingcount']);   // G2 students didn't submit yet.
 
         // Should return also 1 participant if we allow the function to auto-select the group.
         $result = mod_assign_external::get_submission_status($assign->get_instance()->id);
         $result = external_api::clean_returnvalue(mod_assign_external::get_submission_status_returns(), $result);
         $this->assertCount(0, $result['warnings']);
         $this->assertEquals(1, $result['gradingsummary']['participantcount']);
+        $this->assertEquals(0, $result['gradingsummary']['submissiondraftscount']);
+        $this->assertEquals(1, $result['gradingsummary']['submissionssubmittedcount']); // One student from G1 submitted.
+        $this->assertEquals(1, $result['gradingsummary']['submissionsneedgradingcount']); // One student from G1 submitted.
+
+        // Now check draft submissions.
+        list($assign, $instance, $student1, $student2, $teacher, $g1, $g2) = $this->create_submission_for_testing_status(false);
+        $this->setUser($teacher);
+        $result = mod_assign_external::get_submission_status($assign->get_instance()->id, 0, $g1->id);
+        $result = external_api::clean_returnvalue(mod_assign_external::get_submission_status_returns(), $result);
+        $this->assertCount(0, $result['warnings']);
+        $this->assertEquals(1, $result['gradingsummary']['participantcount']);
+        $this->assertEquals(1, $result['gradingsummary']['submissiondraftscount']); // We have a draft submission.
+        $this->assertEquals(0, $result['gradingsummary']['submissionssubmittedcount']); // We have only draft submissions.
+        $this->assertEquals(0, $result['gradingsummary']['submissionsneedgradingcount']); // We have only draft submissions.
     }
 
     /**
diff --git a/mod/assign/upgrade.txt b/mod/assign/upgrade.txt
index e29849006b3..2a12439b11a 100644
--- a/mod/assign/upgrade.txt
+++ b/mod/assign/upgrade.txt
@@ -1,8 +1,8 @@
 This files describes API changes in the assign code.
 
 === 3.5 ===
-* Functions assign:get_assign_grading_summary_renderable, assign:can_view_submission and mod_assign_external::get_submission_status
-  now admit an additional group parameter.
+* Functions assign:get_assign_grading_summary_renderable, assign:can_view_submission, assign:count_submissions_with_status,
+  assign:count_submissions_need_grading and mod_assign_external::get_submission_status now admit an additional group parameter.
   This parameter can be used to force those functions to retrieve data only for the given group.
 
 === 3.4 ===