Marcus Rashford and Ashley Young are both injury doubts after limping out of Thursday's Europa League semi-final first-leg win at Celta Vigo, while Luke Shaw, Zlatan Ibrahimovic and Marcus Rojo are long-term absentees.
"Now we have a second game and we have to be ready because it will be a big game for us".
Considering they have won just four of their last 11 league fixtures, odds of 3/4 (1.75) certainly seem generous on Arsenal failing to overcome Manchester United yet again here.
"We had a lot of chances, it's happened a lot of times this season, but we have to carry on working on it and keep creating chances". We know in football anything can happen, we can go there and do something.
"It's Old Trafford, it's their home they should be going and dominating us". I think it helped put the goalkeeper off, because he took a step to his left and that opened up the space for Marcus to score.
"We tried to win the match".
Although United hold the advantage going into next Thursday's second leg at Old Trafford, Mourinho feels the tie could have been over had his side taken their chances. "They have quality players in attack and they are a quality team, but we are ready for the match".
"It is still close", the Sweden worldwide said.
"So for me not a problem at all and I think he will be really pleased with me that I am going to change my team against Arsenal".
"We are always confident but it's still a semifinal and anything can happen".
"We had good chances in the first half that we didn't finish". I don't think the Manchester United fans are going to be happy with them just sitting back and doing nothing.
The 20-year-old had a very impressive loan spell with Portuguese side Belenenses, Pereira returned from his loan spell back in January and was rewarded for his efforts with his first senior appearance in theFA Cup victory over Wigan Atheltic.
The away goal could prove crucial but the narrow winning margin means Mourinho will, as suggested on the eve of the first leg, rest several players when United return to Premier League action on Sunday.
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