Arsenal boss Arsene Wenger is cautious over committing Theo Walcott to a return from injury against Manchester United next week.
Walcott has missed the victories over Everton and Celtic with a back injury and is sidelined for this weekend's Barclays Premier League match against Portsmouth, with Wenger's men then facing Tony Mowbray's side again before the United clash.
"There is a slight concern but we believe it is a question of days and not of weeks," Wenger said.
"We will see [if he is fit to face United next Saturday]. It is always difficult to set a date. I thought he would be available for Celtic, I thought he would be available for Everton, but he wasn't. That's why we will be cautious."
Eduardo is available for the Pompey clash after a late withdrawal from the win over Celtic on Tuesday
"Eduardo had a tight groin in the warm-up and he felt he could not play," said Wenger on Arsenal TV Online. "He had no power and we had to change [the teamsheet] quickly."
Wenger added: "I don't believe we have anyone injured from Tuesday night's game at Celtic
"Eduardo I believe will be back in contention but Theo Walcott will not be back at all. Tomas Rosicky, Johan Djourou, Samir Nasri, Lukasz Fabianski - they will all be out."
Wenger, meanwhile, has been linked in Holland with PSV Eindhoven winger Balazs Dzsudzsak.
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