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Veteran defender Martin Keown is a major doubt with a hamstring while Pascal Cygan will miss this game out to a suspension. It could be that Oleg Luzhny returns to take Cygan's place.
England International Ashley Cole could return after recovering from a hernia operation, however Wenger is in limbo as he his to decided whether or not goalkeeper David Seaman is fit enough to make his 1,000th professional appearance after a hamstring injury, if not Stuart Taylor will remain in goal.
The Blades has a bit of a crisis with there full-backs ahead of there short trip over the pennines to Old Trafford.
Phil Jagielka is rated 60-40 to play, though Neil Warnock believes that he will bit fit, meanwhile Robert Kozluk and John Curtis are 50/50.
Recently midfielder Macel Cas, who was bought from Nott's County a few months ago has been playing in that right-back position but sadly he is cup-tied and Warnock could struggle to put out a strong eleven on Sunday.
Also cup-tied is Owen Morrison who played for Sheffield Wednesday in there 4-1 defeat to Gillingham in round 3 and Dean Windass who played for Middlesborough against Chelsea in the same round.
Long term injury victims are Steve Yates, Iffy Onoura, Simon Tracey and recently Ben Doane (another right-back) will all miss the Old Trafford experience.
Prediction: Arsenal 0-0 Sheffield United (Blades win on penalties)
Blades-Mad are not 100% of the FA Cup rules but we believe that if the score is level after 90 minutes it will go into extra-time. Should the score still be level after extra-time we believe that it will go to penalties.
Arsenal | Taylor Luzhny | Campbell | Lauren | Vierra Parlour | Ljungberg | Toure | Sliva Bergkamp | Henry |
 Sheffield United | Allison | Kabba Tonge | Brown | McCall | Ndlovu Kozluk | Page | Murphy | Jagielka Kenny |
