The Football Association has begun an investigation into bottle and flare throwing incidents at Saturday's FA Cup tie between Millwall and Crystal Palace at The Den.
However, the governing body can only continue to push police on the alleged homophobic chanting aimed at Palace midfielder Conor Gallagher, who is on loan from Chelsea.
Referee Anthony Taylor's report into the FA Cup third round-tie, which Palace won 2-1, will be studied before the FA decide what to do next.
In the first meeting of the two south London rivals in nine years, flares were thrown by both sets of supporters and Palace midfielder Michael Olise was struck by a bottle as he was about to take a corner.