Liverpool great Graeme Souness says Chelsea should hand Willian the new three-year contract he is seeking.
The Blues are only willing to offer an extra two years to the Brazilian winger - who looks set to leave for free this summer.
Souness reckons the Blues would regret letting Willian slip away.
He told Sky Sports: "I think he's their best player,
"He wants a three-year [deal], they've offered two. I'd be giving it to him.
"You watch him play, he doesn't look like a player to me whose legs are going anytime soon and he's got great qualities.
"So I would be bending over backwards to keep him at the football club."