The Red Devils failed to win a trophy this season, with ManchesterÂ United losing in the FA Cup final against Chelsea, while finishing second behind Manchester City in the Premier League.
Mourinhoâ€™s side ended up a staggering 19 points behind their arch-rivals, with City storming to the title.
And according to former United ace Sharpe, the Old Trafford board should consider sacking Mourinho, adding the Special One has lost his magic touch.
â€śI think they might need a new manager. Itâ€™s a tough one because theyâ€™ve got some unbelievable players,â€ť Sharpe said to the Daily Star.
â€śMourinho wouldnâ€™t have been my first choice if Iâ€™m honest.
â€śWhen he came to Chelsea he was a breath of fresh air in his press conferences and was unpredictable.
â€śNow he just seems to be a bit unhappy, down and dour. Thatâ€™s totally the opposite to when he first came over and his team performances reflect that.
â€śItâ€™s a shame. If he just lightened up a bit and had a sense of humour then the team would reflect it.
â€śThereâ€™d be a lighter step in the dressing room and on the pitch.
â€śYouâ€™d see it in the performances. At the moment performances just seem to be slow.
â€śRival teams are too knowledgeable and organised for you to play that way.
â€śYou look at other successful teams this year – Tottenham, Manchester City and Liverpool – they all play disruptive quick football and teams canâ€™t get a grip on them.â€ť
Mourinho has won three major honours during his time at United, guiding the Red Devils to the EFL Cup, the Europa League and the FA Community Shield.