Our two-time players' of the year has enjoyed periods of excellence during his time at Stamford Bridge, but has struggled to match the productivity of attacking counterpart Eden Hazard.
But the situation of Willian can overturn quickly if Antonio Conte does not remain the manager of Chelsea in the next season. Reports in recent days have suggested that the 26-year-old is on the lookout for a new club after being told he may not feature regularly under now Arsenal boss Unai Emery.
Willian is a typical Mourinho player as he does a lot of tracking back and defending.
It's not impossible for a deal to be completed between the two clubs, and Newcastle may just have to accept that it's a sign of the times.
"So if he has that mentality, I don't ask him to say "I don't want any money", but if he goes there he must make sure he will die for the club".
Manchester United ready to make shock move for Chelsea star
"He can improve (them) a lot".
Martial played in the Chilean's absence on the South Coast on Friday night but was part of a dismal team performance that saw manager Jose Mourinho question his impact.
"So, I would be really happy for him".
Manchester United will demand a record fee for Anthony Martial if he is to leave the club this summer. "We talked a little bit about that".