The second banner flown over Old Trafford carried the statement 'Fergie Back in 6/1 Paddy Power'.
Manchester United manager David Moyes is under pressure after a poor season.
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Four migrants who tried to cross the Channel in an inflatable dinghy have reportedly been rescued by French coastguards.
The victim, a man in his 40s, is being treated in hospital for "life-changing" injuries after the attack by two men who remain on the run.
Heavy security presence as 64,000 fans gather at the Stade de France stadium for the Six Nations rugby match between France and Italy.