Manchester United have agreed to sell Angel Di Maria to Paris St Germain for 63million euros.
Angel Di Maria is set to undergo a medical with Paris Saint-Germain ahead of a proposed £44m move from Manchester United.
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.