That is the verdict of former Manchester United and England midfielder Lee Sharpe.
Mourinho is under serious pressure after seeing his United side lose three of their first seven Premier League games of the season.
The most recent defeat came on Saturday with a 3-1 loss at West Ham, just four days after being dumped out of the Carabao Cup by second-tier Derby.
Mourinho’s relationship with star midfielder Paul Pogba has also hit the headlines with Pogba stripped of the vice-captaincy last week and told he will not captain the side again.
All this means Jose Mourinho is the favourite with the bookies to be the next manager in the Premier League to be sacked.
Sharpe admits recent performances from United have not been acceptable and says a change will need to be made if things do not change soon.
“You can’t have performances and results like they are getting,” Sharpe told talKSPORT.
“If you’re out of that top four it’s so massive for these clubs these days that you just can’t afford to let it happen.
“If they don’t do anything this week and the results keep going the way they have been going, then a change has to be made sooner rather than later.
“Their performances, although they have won a couple, they haven’t been that great going forward and they haven’t looked that impressive.
“When you look at the likes of (Manchester) City, Liverpool, Tottenham and Chelsea, all their rivals are playing quick, high-tempo football and scoring goals, but United are just struggling over the line with results.
“With the Derby result in the week and this one now (against West Ham), plus the thing with Pogba going on, it just heaps pressure on the manager.
“It will be interesting to see what happens over the next couple of weeks.”
United are back in action on Tuesday when they host Valencia in the Champions League (8pm).
The Red Devils won their first game of the their group two weeks ago, beating Young Boys 3-0.
United are back in Premier League action on Saturday against Newcastle (5.30pm).