Commenting on the incident after the game, Fulham caretaker-boss Lawrie Sanchez said: "I didn't see the (Brown-Alonso) incident but saw Alonso have treatment on the side of the pitch.
"I asked Browny what happened at half-time and he said they ran into each other, there was no head-butt.
"I believe my captain if he says that. He did say they clashed heads but added there was no intent.
"What will be will be - it's not for me to decide what the Football Association will do.