Fletcher has recently returned from two months on the sidelines with a stomach virus, but is hoping to be selected for United to face the Spanish side.
“I feel ready to play,” said Fletcher.
“I have had a couple of reserve games, which I have found even more difficult because other people are trying to make an impression.
“It was important to get 90 minutes today ahead of the big game next weekend but now it is not for me to decide. All you can do is your best.
“The lads who got us there have done really well, so the manager has a lot of decisions to make.
“We have a big squad, everyone is fit and there is competition for places on the bench.”
United assistant manager Mike Phelan added: “Darren has had a difficult time.
“A Darren Fletcher up and running and firing on all cylinders gives us a hard job of picking the team.
“It is never easy to come back when you have been out for so long. Now we will recover him and see where he is at in a couple of days’ time.”
