Diouf could be set to return to the scene of his first ever strike for the Potters, who edged their way to a shock 1-0 win in August 2014.
Former Manchester United striker Mame Diouf has suffered a shoulder injury which could affect his future.
Cardiff signed Magnus Eikrem earlier this week but could add three more recruits this January - all of whom have played for Manchester United at some point.
Who may leave the Bundesliga and head to the Premier League?
With days left until transfer deadline day Here Is The City looks at the players from Manchester United who may be looking for a fresh start elsewhere.