Fletcher has not featured for United since a Champions League clash with Benfica in November, due to a chronic bowel problem.
It has been feared that Fletcher would never play again.
United boss Sir Alex Ferguson revealed last month that the Scottish midfielder was yet to train with the res of the squad.
Fletcher has recently returned to training for United and will now also get involved with the Scotland squad.
“Darren will be with us at the weekend,” said Levein. “He is back in training and he played 45 minutes in a practice match last week.
“He is not in the squad because he has not played for Manchester United but he will come back and do a bit of training with us.”
