Former Manchester United full back Paul Parker was not amused after Jose Mourinho launched his first jab at arch-rival Arsene Wenger.
The Portuguese told reporters that he has nothing to prove having won the English Premier League only two years ago, unlike those who haven't won it for ten years.
And Parker has warned him that he should not use the club to launch personal battles against other managers.
"His style worries me," Parker told the talkSPORT.
"When he had his press conference and he brings up Arsene Wenger – that worries me.
"He shouldn't be talking about it, it's irrelevant. If he wants that personal battle he should do it on his own time but don't use Manchester United to do what you were doing at Chelsea.
"He's not managing Chelsea anymore."