West Ham United has demanded that Manchester United should include Anthony Martial in the deal to sign defender, Issa Diop, SportsMail reports.
Manchester United are in the market for a central defender this summer, as Ole Gunnar Solskjaer looks to reshuffle his back line.
However, Ole Gunnar Solskjaer have targeted Diop, following his impressive debut campaign with the Hammers.
West Ham United has knocked back £40million from Manchester United, who are only willing to sell the player if highly-rated winger Martial is involved in the deal.
Although, the club are reluctant to sell the 22-year-old, who they signed from Toulouse in a club-record £22million deal in June 2018.
The France International became the second signing of manager Manuel Pellegrini and penned a five-year contract with the club.