Dutch coach says he has apologised to fourth official Mike Dean after comical second half incident.
Old Trafford plays host of a pivotal day in the title race and pursuit of Europe.
The Gunners however do boast cash reserves of £135.9m.
19-year-old versatile defender moved to North London in the summer of 2014 from Barcelona's academy.
French boss says that Gabriel Paulista is still doubt for the trip to Old Trafford.
Lee Dixon says Arsene Wenger has no excuses but to use the club's significant cash reserves.
The Mirror has reported that Arsenal are willing to make a £20m summer bid to secure his services.
Jack Wilshere, Santi Cazorla and Tomas Rosicky remain on the sidelines for the trip to Old Trafford.
The Gunners have a massive week ahead, with a trip to Old Trafford before the games with Swansea and Tottenham.
German defender deflects blame for loss which leaves Gunners' European ambitions hanging by a thread.
Birmingham City manager Gary Rowett has claimed he is eager to get him on a permanent deal.
The retired defender admits the Gunners need to bridge a sizeable gap between themselves and Europe's elite.
Retired defender thinks the Reds face an impossible task to progress in the Champions League.
The 29-year-old striker has spoken of his admiration of the Anfield club.
Wenger was left particularly frustrated after his side allowed themselves to concede via a counter-attack.
Manchester United star previews the game between his compatriots and his Premier League rivals.
The 25-year-old defender will miss the much-anticipated tie with an injury.
Spaniard has been out of action since the 1-1 draw with Norwich City on 29 November.
The 55-year-old Spaniard has offered his thoughts on the much-anticipated Champions League clash.
Arsenal will aim to beat beat Barcelona to progress in the Champions League
Santi Cazorla and Jack Wilshere are among the four confirmed absentees for the Gunners.
Arsenal legend feels La Liga giants are the easy favourites to make next round of the Champions League.