“[Mourinho] is the wrong man for the job,” Sharpe told Press Association Sport.
“When he came to Chelsea the first time he was quite charming and fun, but now he just seems dour and fed up.
“He’s moaned about not signing new players and not bigging up the ones he’s got.
“His negative style does not fit in with the expansive football that United fans want. I think he’ll be gone before Christmas.”
Ex-England international Sharpe added that Mourinho’s public fallouts with multiple players at the club – his relationship with captain Paul Pogba is the latest to come under scrutiny – would never have happened under United legend Sir Alex Ferguson.
“I do not think Mourinho has handled the Pogba situation very well.
“It was the same with Luke Shaw before that. Any views should be kept in-house and not appear in the press.”
Sharpe, who played for United from 1988 to 1996, referred to Mourinho’s accusations about rivals City lacking class, made after an Amazon TV series about City included several negative mentions of the United manager, while expressing his disapproval of Mourinho’s use of the media to criticise players.
“Mourinho talks about class but that is the sign of class in my eyes.
“Every player who played for Sir Alex Ferguson – whether they liked him or not – respected him because you knew that any grievances would not be aired in the press.”
Manager Jose Mourinho has cut a frustrated figure as his team have laboured through pre-season and the opening weeks of the new campaign.
A rousing 2-1 win to open the campaign at home to Leicester was completely undone by the woeful nature of their defeat at the Amex Stadium on Sunday.
Here, we take a look at a summer of discontent at Old Trafford.
Mourinho had hoped to strengthen his squad significantly during the summer transfer window, but it ended without the arrival of the commanding defender he had wanted.
Despite being linked with the likes of Raphael Varane, Harry Maguire, Jerome Boateng, Diego Godin and Yerry Mina, United added only Fred, Diogo Dalot and Lee Grant to the mix.
Speculation persists that relations between Mourinho and the club’s executive vice-chairman Ed Woodward are strained.
WORLD CUP WAIT
The manager was less than impressed after having to start pre-season without some of his biggest names after France, England and Belgium enjoyed extended stays at the World Cup finals and severely depleted his resources.
Paul Pogba, Romelu Lukaku, Marouane Fellaini, Ashley Young, Jesse Lingard, Phil Jones and Marcus Rashford were all missing, although most answered Mourinho’s call to cut short their post-tournament breaks.
Anthony Martial found himself in the firing line after leaving the club’s US tour to attend the birth of his second child.
Mourinho made little secret of his displeasure at the Frenchman’s failure to return to the fold as quickly as he had expected, but 22-year-old Martial insisted his family would always come first.
He started against Brighton but had little impact and was, predictably, one of the players to make way in the second half.
THE PROBLEM WITH POGBA
Paul Pogba has been something of an enigma since his club record £89million switch from Juventus in August 2016. His form on the pitch has been patchy to say the least, and rumours of a fractious relationship with his manager have refused to go away.
Pogba did little to stem the speculation when he replied “There are things that I cannot say otherwise I will get fined” when asked if he was happy at Old Trafford following a swashbuckling display against Leicester, including opening the scoring with a brilliant penalty.
Mourinho, who has made the Frenchman his captain, has repeatedly insisted there is no issue.
If things have been tetchy off the field, they have been little more relaxed on it. United stuttered through pre-season as they lost to Liverpool and Bayern Munich, earning a 2-1 win over Real Madrid, although it was Los Blancos’ maiden match of the summer.
They started brightly and ultimately got the victory in the 2-1 victory over Leicester in their Premier League opener. However, they turned in a dreadful display to go down 3-2 at Brighton on Sunday with the scoreline flattering them somewhat as Pogba’s penalty with seconds remaining put a little more gloss on the scoreline than they deserved.
After a positive start to the 2018/19 campaign with a 2-1 home win over Leicester last week, United came crashing down with a woeful performance in a 3-2 defeat at Brighton on Sunday.
But former striker Berbatov believes there is no need for Red Devils fans to be worried despite their team’s disappointing display at the Amex Stadium.
In a video posted on his Instagram page, Berbatov said: “Obviously we’re all disappointed and I didn’t expect that result to be honest. But hey, it’s too early in the season. Don’t be worried. You have games like this.”
Goals from Glenn Murray, Shane Duffy and a Pascal Gross penalty helped Chris Hughton’s men to all three points, with Romelu Lukaku heading in to make it 2-1 before Paul Pogba’s late penalty gave United a consolation.
Jose Mourinho pointed to his side making “big mistakes” as the reason for their defeat – the second time they’ve lost away at Brighton in the space of a little over three months.
Berbatov, who played for United for four years and won two league titles with the club, does not feel the need to panic at this stage, however, insisting it’s still early in the season.
“You win some, you lose some but the good thing is there’s always the next game to make things good again. So come on.”
Next up for the Red Devils is a home meeting with Tottenham on August 27, before meeting with Sean Dyche’s Burnley on September 2.