Wahbi Khazri is considering his future at Sunderland.
The winger has battled to win over Sunderland boss David Moyes, though has just broken back into the first team.
Tunisian media sources say Khazri could demand a transfer ahead of the winter market.
Espanyol coach Quique Sanchez Flores is keeping a close eye on the situation, while a return Ligue 1 can also not be ruled out.
Khazri only joined Sunderland in January from Bordeaux.