Millwall manager Kenny Jackett expects Leeds striker Jermaine Beckford to be punished following his clash with goalkeeper David Forde during Monday's 2-0 defeat at Elland Road.
The Lions keeper was elbowed in the face by Leeds' two-goal match-winner and Jackett was unhappy with the opposition striker.
Beckford was only booked by referee Alan Wiley after the offence had been pointed out to him by his assistant.
"I didn't see the offence but I've seen my goalkeeper's jaw and eye and they don't look good," said Jackett.
"He's got a fair bit of damage down the side of his face. Some key decisions just didn't go our way, but we also didn't do enough and we need to score more goals."