Chelsea icon Frank Lampard has urged his old club to think carefully about selling Diego Costa this summer.

Lampard has warned the club against offloading Diego Costa.

"He's a fantastic striker and we all saw that last season and since he's been at Chelsea," Lampard told Sky Sports.

"He would be difficult to replace, there's no doubt about it.

"I don't know where Diego Costa's mind is, whether he wants to leave or not, that's all speculation. One thing that is for sure, is that you've got a great striker in him.

"So if he stays, brilliant. If he doesn't, then you'll have to go to the top end of the world's strikers to replace him."