A man has been arrested in connection with the disorder at the West Ham v Manchester United match.
Bottles and other objects were hurled at Man United's coach as it entered the Boleyn Ground on Tuesday.
A 28-year-old man handed himself into an east London police station on Friday, 13 May.
He was arrested on suspicion on violent disorder and bailed.
Detectives are still appealing for the public's help in identifying three other men.
The Manchester United manager Louis Van Gaal has said the club agreed to sell the England striker Danny Welbeck to Arsenal because he did not have the goalscoring record of other strikers at the club.
Welbeck joined the Gunners right at the end of the transfer window after United brought in Colombian striker Radamel Falcao. He scored ten times for United last season.
Welbeck could get his first game in an Arsenal shirt against Manchester City on Saturday.
- While Jose Mourinho has admitted the door would be open for Mata to leave, Chelsea are under no financial pressure to sell
- United are looking to kickstart what has so far been a stop-start Barclays Premier League campaign
- While Chelsea may well prefer to offload Mata abroad, seeing him move to Old Trafford would not necessarily impact on their own title bid as they have played United twice now,
It's reported Chelsea's Juan Mata, who is no longer a regular under Jose Mourinho, missed training today when the squad reported back to prepare for the weekend's FA Cup tie against Stoke on Sunday.
Manchester United are said to be ready to launch what would be a club-record £37million bid for the 25-year-old midfielder, who wants to be playing in World Cup year.
Jose Mourinho has described Chelsea's match against Manchester United on Sunday as "especially dangerous". He says his experience in the game has taught him "we don't play a team that's eleven points behind the leader, we play against the champions".
He added: "I've played dozens and dozens of derbies and classic matches ... and this is what experience says. And, more than that, many times and on many occasions, the team that looks to be in the most difficult situation is the team that appears stronger in that match"
Manchester United have reached an agreement to sign highly-rated winger Wilfried Zaha from Crystal Palace.
The 20-year-old, who won his first England cap in November, will finish the season with Palace and link up with United in July under the terms of the agreed deal.
A statement on United's official website read: "Manchester United, Crystal Palace and Wilfried Zaha have reached an agreement for the player to join Manchester United in July 2013.
The FA has released a statement in relation to the Chelsea FC v Manchester Utd game on Sunday 28th October 2012. It says it has concluded its investigation into alleged misconduct by Mark Clattenburg during that match and will take no disciplinary action will follow against Mr Clattenburg.