He should also shake up the rest of his team and I would go with James Milner and Georginio Wijnaldum in midfield, with Virgil van Dijk not needed in defence for a tie that is already won.
Victory over Palace has allowed United to move back into second spot in the Premier League table.
Then Romelu Lukaku got on the score sheet with a hilarious goal that just sounds better with the Spanish commentary, finishing low after a ball hit the crossbar.
When Townsend struck the opening goal it was the first time Palace had led United in the Premier League and the home fans could hardly believe their eyes when their Dutch global Van Aanholt beat De Gea at his near post with a rasping drive.
"It was a hard match for me because my team made so mistakes", he told Sky Sports. In these kind of games, if we can manage to win we can compete for the title. "We had wonderful attitude and had very good quality football in the second half, but we made so many defensive mistakes and I'm not just speaking of my defenders".
"But with that disgraceful, childish (goal) - you can find so many adjectives for that second goal. everything changed but the players kept an wonderful attitude".More news: Coalition deal in Germany to go ahead
United appealed in vain for offside but the flag stayed down and van Aanholt held his nerve to slot past De Gea for his first goal since May 2017.
"We believed until the end and we did exactly what the manager wanted from us".
But Smalling insisted the players did not need Mourinho's harsh words to know the first half performance had not been good enough. It would have been nice to have two more points, but we still would have been very much in a relegation battle.
"Matic scored awesome goals like this when he was with me at Chelsea, at Goodison Park, against Benfica".
Earlier this week, Manchester United fielded a strong team that played poorly in the first half.
Mourinho further added: "This season against Benfica, it was half a goal for him and half a goal for the Benfica goalkeeper [Mile Svilar]".
United hosts Liverpool at 7:30 p.m. Saturday at Old Trafford.