Walcott's fledgling career has been riddled with injuries
Arsenal manager Arsene Wenger admits he is concerned how Theo Walcott's latest injury setback will affect the England international on a mental level.
Walcott, 21, faces up to six weeks out after damaging his ankle in England's 3-1 Euro 2012 qualifying win over Switzerland on Tuesday.
Wenger said: "It is frustrating for him. You never know what kind of psychological impact it has.
"The mental side is always a question mark when a player gets injuries."
Walcott first suffered a lay-off in November 2008, when he dislocated a shoulder on England duty, ruling him out for six months.
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A litany of further problems, including back, knee and hamstring injuries, marred his 2009-10 season - his stop-start availability for his club culminating in his controversial omission from England manager Fabio Capello's World Cup squad.
And Wenger added: "When you are a manager and you see an injury doesn't harm the career of a player, you are happy.
"After that the only unknown quantity is how much it will damage his confidence in the box, on tackling and all that."
But, despite his bad luck, Wenger has backed the player he acquired for £5m from Southampton in 2006 to once again bounce back.
"Ideally, you do not want a player to be injured many times by bad tackles," added the Frenchman.
"However, I believe Theo will deal well with that because he has done it before."
Second-placed Arsenal resume their Premier League campaign at home to Bolton on Saturday, with Wenger also without the talents of striker Robin van Persie, whose ankle knock carries approximately the same prognosis as Walcott's, and central defender Thomas Vermaelen (Achilles).
Winger Aaron Ramsey, meanwhile, is expected back in November as the Welshman continues his rehabilitation from the broken leg he suffered at Stoke last February.
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