Police have confirmed that a total of 14 men were arrested at the Millwall v Wigan FA Cup semi-final at Wembley Stadium yesterday.
Twelve of those arrested were Millwall supporters and two were Wigan supporters.
Millwall manager Kenny Jackett was not aware of the scuffles when quizzed soon after the full-time whistle.
"I've just heard about that," he said. "I wasn't aware of any fighting during the game, not aware of any problems. I'll need to examine the facts before I can give an opinion.
"I promise you, I wasn't aware of it during the game. I am not saying it didn't happen. Until I see it, it is difficult to form an opinion."We want to be talking about football. I need to be able to form my own opinion. I am sure the evidence is there. I am not denying that."
Jackett vowed the club were doing all they could to rid themselves of their reputation for hooliganism.
"That has been our greatest challenge," he said. "We want to try and work hard to keep momentum going forward. I understand what you are saying. If there was crowd trouble ... It will hold us back if that happens repeatedly.
Dave Whelan, chairman of Wigan, who won the FA Cup semi-final against Millwall 2-0, said he could not understand Millwall fans fighting each other.
– Dave Whelan, chairman of Wigan
I can't understand why the Millwall fans would fight each other.
I understand if they want to fall out with the visiting team, but why would they fall out amongst themselves? It just gives football a very, very poor reputation.
We know Millwall are a tough club, their team's tough to play, the supporters are Millwall Millwall Millwall ... straight through. But don't fight each other. I couldn't understand that.
The Wigan chairman was speaking to BBC Radio 5 Live.
Millwall fans were condemned tonight after crowd violence marred the FA Cup semi-final at Wembley.
During the second half of their 2-0 defeat by Wigan, around 20 Millwall fans began fighting with each other behind the goal in disturbing scenes which left youngsters in tears and were witnessed by millions on television.
The club has vowed to find the yobs.
– Millwall chief executive Andy Ambler
Our position is clear. Anyone associated with our club found guilty of violent behaviour will be banned indefinitely from Millwall matches in addition to any punishment they receive from the authorities.
Chairman John Berylson, who flew in from the United States for the game, said: "There are always a few idiots. That's not our fan-base and we don't even know who those people are. We will be investigating."
Lions manager Kenny Jackett said: "I haven't seen it on TV yet but it doesn't sound good"
The Football Association has said today's scenes of violence involving Millwall fans at the FA Cup semi-final are "unacceptable":
– Alex Horne, general secretary of the FA
The Metropolitan Police and the FA are this evening investigating scenes of sporadic violence and disorder in the Millwall FC end at today's FA Cup semi-final.
The FA and Wembley Stadium will work with police and representatives of Millwall FC to review all events.
We will look to ensure those involved are identified and we would call for criminal charges and a football banning order to be brought against them.
The FA deplores the scenes which have taken place, which are unacceptable. Everything will be done to take action against those involved.
Millwall football manager Kenny Jackett said he had not seen incidents of crowd trouble at today's FA Cup semi-final, but added:
– Kenny Jackett
If there was crowd trouble ... It will hold us back if that happens repeatedly.
We have worked very hard, the chief executive and chairman, to do everything we possibly can to be trouble-free. We have had high-profile games that have gone very well. We have done everything we possibly can.
Police said they are investigating incidents involving Millwall supporters at today's FA Cup semi-final that left some fans bloodied and younger ones in tears.
A Scotland Yard spokesman said:
Ten people have been arrested following sporadic disorder among fans in the Millwall supporters' area at Wembley. Investigations into the circumstances of the incidents are continuing.
Ten football fans were arrested after fighting broke out in the Millwall supporters' area during the south London club's defeat to Wigan in the FA Cup semi-final at Wembley, the Metropolitan Police said tonight.
Wigan Athletic are celebrating an historic victory after they beat Millwall 2-0 to reach the FA Cup final for the first time.
The Latics are also guaranteed a place in the Europa League next season, the first time the Lancashire side has qualified for European competition.