Liverpool legend Bruce Grobbelaar is unimpressed by goalkeeper Simon Mignolet.
Grobbelaar believes there are big flaws in Mignolet's game and says he cannot be compared to his Chelsea title-race rival Petr Cech.
On an interview to promote the Prostate Cancer UK charity, said: "Mignolet is a good shot-stopper, but by no means the best all-round keeper.
"A good keeper should be easy on his feet, plays out from the back and commands himself in the penalty box.
"A keeper should never be beaten - as he has been - by a header from three yards out. The keeper coach has to work him harder and he can improve a lot, of course he can.
"Another point is his positioning on free-kicks. His starting position is not right. The team and the defence is too far back for the keeper. They're on top of him. He's not commanding enough.
"Another reason I look at Mignolet is the number of goals he's conceded. Any team which concedes that number of goals should not be top of the league.
"You compare that to the number of goals Petr Cech has conceded at Chelsea and that tells you the difference. Any good team starts from the back."
