Arsenal manager Arsene Wenger has revealed he expects midfielder Jack Wilshere to be out for a further two or three weeks after suffering a setback in his recovery from an ankle injury.
The 19-year-old has not featured for the Gunners this season after picking up the injury in their pre-season friendly against New York Red Bulls at the end of July.
An initial scan showed no broken bone and the midfielder wore a protective boot in order to aid his recovery, raising hopes of a return within a week.
Wenger had earlier refused to set a date for the England international's comeback, although there were hopes he could be involved in their UEFA Champions League qualifying second leg tie against Udinese on Wednesday.
However, Wilshire appears to have suffered a setback in his rehibilitation and Wenger has now conceded the player will be out up to three weeks, ruling him out of the Udinese game, the trip to Old Trafford on Sunday and England's Euro 2012 qualifiers against Bulgaria and Wales at the start of next month.
"I don't know if we are back to square one or for how long he will be out," said Wenger.
"He's in a boot again, so that means he will at least be out for two or three weeks."