Images have been released of two men police would like to speak to in connection with recent disorder during Millwall's FA Cup third-round defeat.
Crystal Palace defeated Millwall 2-1, but the game was marred by some unsavoury scenes off the pitch.
Police said a glass bottle was thrown from the home section of The Den.
Insp Matt Ashmead said the Met Police was "committed to identifying" those responsible and "ensuring they face appropriate sanctions".
"The vast majority of football fans go to matches simply to enjoy themselves and support their team," Insp Ashmead said.