diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 0db01a84656..3d7bceadcf3 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -1618,7 +1618,7 @@ class Form
     public function select_dolusers($selected = '', $htmlname = 'userid', $show_empty = 0, $exclude = null, $disabled = 0, $include = '', $enableonly = '', $force_entity = '0', $maxlength = 0, $showstatus = 0, $morefilter = '', $show_every = 0, $enableonlytext = '', $morecss = '', $noactive = 0, $outputmode = 0, $multiple = false)
 	{
         // phpcs:enable
-		global $conf, $user, $langs;
+		global $conf, $user, $langs, $hookmanager;
 
 		// If no preselected user defined, we take current user
 		if ((is_numeric($selected) && ($selected < -2 || empty($selected))) && empty($conf->global->SOCIETE_DISABLE_DEFAULT_SALESREPRESENTATIVE)) $selected = $user->id;
@@ -1679,6 +1679,10 @@ class Form
 		if (!empty($conf->global->USER_HIDE_INACTIVE_IN_COMBOBOX) || $noactive) $sql .= " AND u.statut <> 0";
 		if (!empty($morefilter)) $sql .= " ".$morefilter;
 
+		//Add hook to filter on user (for exemple on usergroup define in custom modules)
+		$reshook = $hookmanager->executeHooks('addSQLWhereFilterOnSelectUsers', array(), $this, $action);
+		if (!empty($reshook)) $sql .= $hookmanager->resPrint;
+
 		if (empty($conf->global->MAIN_FIRSTNAME_NAME_POSITION))	// MAIN_FIRSTNAME_NAME_POSITION is 0 means firstname+lastname
 		{
 			$sql .= " ORDER BY u.firstname ASC";
diff --git a/htdocs/core/class/html.formother.class.php b/htdocs/core/class/html.formother.class.php
index 829a3f9c72f..b245f5f013b 100644
--- a/htdocs/core/class/html.formother.class.php
+++ b/htdocs/core/class/html.formother.class.php
@@ -424,7 +424,7 @@ class FormOther
     public function select_salesrepresentatives($selected, $htmlname, $user, $showstatus = 0, $showempty = 1, $morecss = '', $norepresentative = 0)
     {
         // phpcs:enable
-        global $conf, $langs;
+        global $conf, $langs, $hookmanager;
 
         $langs->load('users');
 
@@ -440,6 +440,9 @@ class FormOther
             	$out.=$comboenhancement;
             }
         }
+
+	    $reshook = $hookmanager->executeHooks('addSQLWhereFilterOnSelectSalesRep', array(), $this, $action);
+
         // Select each sales and print them in a select input
         $out.='<select class="flat'.($morecss?' '.$morecss:'').'" id="'.$htmlname.'" name="'.$htmlname.'">';
         if ($showempty) $out.='<option value="0">&nbsp;</option>';
@@ -464,6 +467,10 @@ class FormOther
 
         if (empty($user->rights->user->user->lire)) $sql_usr.=" AND u.rowid = ".$user->id;
         if (! empty($user->socid)) $sql_usr.=" AND u.fk_soc = ".$user->socid;
+
+	    //Add hook to filter on user (for exemple on usergroup define in custom modules)
+	    if (!empty($reshook)) $sql_usr .= $hookmanager->resArray[0];
+
         // Add existing sales representatives of thirdparty of external user
         if (empty($user->rights->user->user->lire) && $user->socid)
         {
@@ -485,7 +492,11 @@ class FormOther
             }
 
             $sql_usr.= " AND u2.rowid = sc.fk_user AND sc.fk_soc=".$user->socid;
+
+	        //Add hook to filter on user (for exemple on usergroup define in custom modules)
+	        if (!empty($reshook)) $sql_usr .= $hookmanager->resArray[1];
         }
+
 	    $sql_usr.= " ORDER BY statut DESC, lastname ASC";  // Do not use 'ORDER BY u.statut' here, not compatible with the UNION.
         //print $sql_usr;exit;