Thankfully for United the problem doesn't sound too serious but it remains to be seen whether Rashford will be risked at Arsenal with a huge Europa League second leg next Thursday to worry about.
"So, we have to be sensible and use common sense in relation to our situation in the Premier League, and I think the last match against Swansea was our last chance to fight for a top-four place, so I am going to rest players, sure".
"That means a lot to us and also the performances we have done away from home, " Guidetti, who was born in Stockholm (the host of the final), said. He takes a step to his left because Blind goes over the ball and Rashford gets a good hit on it.
"Of course, if there is a chance you are going to take it but you also keep in mind there is a second game and 1-0 away is a good result".
United beat the Spanish side 1-0 in the first leg on Thursday, but with Wayne Rooney, Juan Mata, Michael Carrick, David de Gea and Chris Smalling on the bench in Spain, Mourinho can still field a strong side against old foe Arsene Wenger.
'That's what he does best.
'We've got Iago Aspas who is not very big, Pione who is not very big, me and Daniel Wass who is not very big so when they bring back Fellaini, Pogba and you put the ball in the box it is going to be hard from there.
Berizzo said, "We have competed equally with a great rival who has lost of passion, who play as a unit".
"We controlled the match against a Celta side that always creates, that is always offensive and is easy on the eye". United did not dominate us running-out 4-0 winners. We know we can do it.
'They played to their strengths; we did not play to ours. Obviously, we're still fighting in the Premier League as well, but we've got to pull together as a squad now and kick on.
'We will attack them there. I think from now until the end of the season every game is big. "The Man United fans expect more than sitting back and taking a 0-0 draw so I think we are going to have even more space, although we should have probably kept it 0-0".