Mourinho has come under criticism this week following Manchester United’s shock Champions League exit to Sevilla.
The Portuguese came out fighting at his press conference yesterday, highlighting United’s failures in European competition in recent years before he came to the club.
But Merson cannot understand why Jose Mourinho would say such a thing about his own club unless he was unhappy in his role.
The former Arsenal forward claims Mourinho may be regretting taking the United job and will be thinking he should have gone to rivals Manchester City or Paris Saint-Germain instead.
“It seems to me that he’s trying to make it a bit unrestful at the moment,” Merson said on Sky Sports.
“You look from a distance at the PSG job, you look at that now, he’s probably looked at the Man City one and he’s probably sitting there thinking ‘I think I’ve bitten off more than I can chew here and Man City are a million miles above us and I need to sort of find a way of getting out of here’.
“You don’t talk like he’s talking at the moment.
“You don’t start knocking Manchester United for what they’ve done in the last so many years.
“Them supporters surely aren’t sitting there going ‘he’s right here’. Surely they’re not saying that.
“And then he’s saying to the players they need to grow up. Everything’s about everybody else but not about him at the moment.
“I think this will end soon, I think it will end soon.”
