Barcelona president Josep Bartomeu insists Lionel Messi will be offered a new contract to keep him at the club.
Fulham striker Dimitar Berbatov has confirmed he would like to stay at Monaco beyond the end of this season.
The 34-year-old has agreed terms with Blues and passed a medical but the club are waiting on a visa application before a one-month deal is completed.
Former Senegal international Diop, who helped West Ham to promotion to the Barclays Premier League last season, has impressed on trial at St Andrew's.
He has also played in England for Fulham and Portsmouth, with whom he won the FA Cup in 2008.