Chelsea Football Club have told arch-rivals, Manchester United to get prepared for a swap deal if they want Willian to join them this summer.
The Blues want to have Anthony Martial included in the Brazilian deal.
Barcelona and Manchester United have shown interest in luring Willian out of Stamford Bridge this summer.
The Brazilian former manager, Jose Mourinho is fond of him and keen of having him join him at Old Trafford.
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UK Telegraph reports that Chelsea will only open the exit door for Willian if the Red Devils release Martial, an out-of-favour player in Mourinho’s squad.
Martial’s agent had earlier confirmed it in June that the player wants to leave the club.
“After thinking about all the possibilities and settings, Anthony wants to leave Manchester United,” Philippe Lamboley told RMC Sport.