Sheffield United manager Neil Warnock believes Graham Poll has "things regarding his persona that could be changed" and the referee is still coming under fire from other quarters after recent controversial decisions.

"I have had big spats with him in the past and I think there are things regarding Graham's persona that could be changed," said Warnock. "Whether that is possible... It is like a player when you get experienced. If you could go back to when you were 19, 20, 21 you would change a lot about yourself.

"I think Graham is one of our best referees. He will have bad days because he will make mistakes."

Poll was been accused by Chelsea's players of trying to teach them a lesson in discipline during their 2-1 defeat by Tottenham on Sunday and Blues captain John Terry also claimed the official changed his mind about the reason for his sending-off in that game.

Poll came under further attack from Everton manager David Moyes and forward James McFadden after dismissing the Scotland international for allegedly calling him a cheat in last night's Carling Cup defeat to Arsenal.

It's a charge McFadden and his manager denies. "James (McFadden) has explained what he said, but he did not call the referee a cheat", said David Moyes today.

Moyes has also taken issue with the treatment of Andrew Johnson after criticise from some quarters that the striker goes down to easily in the box.

The England striker, claim Everton sources, made a conscious effort to change his whole style of play in the last two games to counteract the constant suggestions that he is a diver.

That 'policy change' came after discussions with boss David Moyes about the growing uproar - fuelled by Premiership managers like Warnock and Arsene Wenger - that he goes down too easily in the penalty area.

But Everton and Johnson believe he has been denied two clear penalties - one against Fulham on Saturday after a challenge by Ian Pearce and the other last night in the Carling Cup tie against Arsenal by Philippe Senderos.

And on both occasions the club and player feel he is suffering now because of the reputation he has acquired.

Moyes said: "I definitely feel that Andy is now being punished because of what other people have been saying about him.

"People are talking about our players instead of keeping their mouths shut.

"We have certainly missed a couple of penalty awards in the last couple of games, never mind any other matches beforehand."