Rashford, 19, delivered again for United in the Europa League, his free-kick securing a 1-0 win at Celta Vigo in the semi-final first leg on Thursday.
The trip to Arsenal is important in the race for the top-four, but the Portuguese knows the job is not done in a competition that offers Champions League qualification as well as a historic trophy.
And Mourinho claimed doing anything but rotating his injury hit squad would give the Galicians an advantage ahead of the second leg at Old Trafford.
"After the goal, [Jose] Mourinho's got a lot of experience and he just tells his players 'game's over, game's finished, 1-0, we're not going to play any more football tonight, "' Guidetti said. It overcame a 1-0 loss at home in the round of 32 to Shakhtar Donetsk, and advanced by 2-0 win in the second leg. Celta also defeated Real Madrid away from home in the Copa del Rey, and eventually eliminated Madrid.
Rashford also had to be substituted, but Mourinho said that was a result of a problem he carried into the game. A kid that finished a training session and stays half an hour more every day to take free-kicks and to wait for the opportunity.
'I am going to change my team to play against Arsenal, so I think Wenger will be really happy with me, ' says Mourinho.
"I'm very pleased with the performance, not so pleased with the result", declared Mourinho.
"I think we were in control". "It was difficult for both teams, it was a very hard match and both teams defended well".
Aspas then fired narrowly wide and Pogba tried to catch Alvarez out of position with a free-kick from just inside Celta's half but the ball hit the side netting. "It could have been better, and seeing Celta's trajectory in the Europa League, they definitely deserve respect for the away match". We played well enough to have [the] result closed but we have to go and play at Old Trafford.
"We have created a few good chances and Marcus scored a fantastic goal".
"We need to be human with the players, be sensible and use common sense in the Premier League".