Sunderland boss and ex-Manchester United captain Roy Keane believes Chelsea manager Jose Mourinho has the upper hand over his Premiership rivals.
Ex-Man Utd star Keane was famed for his intensity and determination
"Mourinho has got something and he has the edge at the moment," Keane, 35, told the Sunday Times magazine.
"He plays games and I think they can have a big effect on his team and on the opposition.
"People love to criticise Mourinho. I like watching Chelsea. They are well-organised; they know their jobs."
Keane picked out one incident at the end of last season when he believes Mourinho displayed an instance of his psychological warfare against United boss Sir Alex Ferguson.
"Do you remember when Chelsea played United at Stamford Bridge, end of last season, and there are two minutes to go in injury time, and he gets up, walks up to where the United lads are and he's shaking Alex Ferguson's hand and the game is still going on?
Keane says Rooney has potential but has not proved himself
"The manager would not have liked it. But Mourinho is saying, 'The game is over, the league is over, 3-0 to us.'
"But Alex Ferguson would have taken that on board. That's what good managers thrive on, that kind of slight."
In the revealing interview, Keane also stated that he believes England and United striker Wayne Rooney still has to prove himself.
"For me, the jury's still out on Wayne," he added. "I think he's got a hell of a lot to do. Wayne has achieved nothing - would probably say that himself.
"I would judge players over a few years rather than one or two.
"He's got potential, like I've got potential to be a good manager. Potential is one thing; doing it is another. I feel this season could be a good one for him."
Injury forced Keane to end his career at the end of June after a short stint at Celtic and he said his time in Scotland also made him realise he may have treated some of the foreign players at United too harshly.
One player in particular was Juan Sebastian Veron, who arrived at Old Trafford in a £28m move but failed to live up to expectations.
Keane said: "Celtic couldn't have done enough for me but it was a lonely life and I wish now I had been a bit easier on some of the foreign lads who came to United.
"I always thought 'You're on the pitch now - do it.' I regret that now. I was very hard on Seba and I was wrong.
"When he came, I was expecting miracles. When they didn't happen, I was always homing in on him and I now know it takes time."