A group of Brentford FC supporters went to Putney after this weekend’s play-off match allegedly “just to fight” Fulham FC fans.
A source told the Wandsworth Guardian police had approached "most of the venues" near Putney Station on May 13 to warn them of a group of 15 to 20 men “causing trouble”.
Fulham, who are favourites to be promoted to the Premier League, were playing Reading in the play-off semi-finals at Craven Cottage.
The match ended just before 7.30pm and there was a "significant" police presence in Upper Richmond Road.
Our source said: "They were causing trouble at most venues around Putney.
"It was stupid because their team was not even playing.
"They came down just to fight.
"At one point they had to escort Fulham supporters to safety."
Fulham supporter Jay Adlington, who was at the match on Saturday, said: "We did notice the extra police on Saturday, but thought it was just a precaution for the play-offs."
Brentford supporter, Gary, said he did not know who the culprits were but their behaviour was "not representative" of the the football club's supporters.
He added: "Brentford is a family club."
Brentford FC declined to comment.