Chelsea ace Willian says Arsenal will regret selling Alexis Sanchez.

Sanchez completed a move to Manchester United on Monday, with Henrikh Mkhitaryan, who is cup-tied, going in the opposite direction.

And ahead of tonight's Carabao Cup semifinal, Willian told the London Evening Standard: "To lose this kind of player is not easy.

"It would be like losing Eden here - he is a great player. Is he that important to them? Of course. No one wants to lose this kind of player. They are two great players but [unlike Sanchez] Eden is still here.

“Great players have quality to play in matches like this. Arsenal have other players but Sanchez is special."