The Portuguese tactician took charge of Manchester United in the summer but has failed to mount a serious title challenge, with the club sitting fifth in the table.
The Red Devils host Chelsea tomorrow (4pm) having already lost twice to the Premier League leaders this season.
Paul Merson suggests Jose Mourinho has lost his mojo
Jose Mourinho has won the Premier League three times
Merson has question whether three-time Premier League winner Mourinho will ever lift the trophy again, but is backing the 54-year-old to get a draw at Old Trafford tomorrow.
The former Arsenal striker told the Daily Star: "You have to wonder if Jose Mourinho will ever win the Premier League again.
"Manchester United play Chelsea tomorrow and they look miles behind the team that’s going to win it this year. Mourinho won’t want to lose this game.
Manchester United take on Chelsea on Sunday How Man United could look after £250m summer spending spree Thu, April 13, 2017
Is this how Manchester United could look if Jose Mourinho goes on a £250million summer spending spree?
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How Manchester United could look if Mourinho splashes out this summer
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"He might have rested players for any other game because of the Europa League.
"But he’ll remember what happened at Stamford Bridge and how the Chelsea fans gave him loads of stick for losing. He won’t want that to happen again.
"I think he’ll play the strongest side he can and probably get a draw. Chelsea would take that. This is the hardest game they have left."