Eberechi Eze's opening goal for Crystal Palace against Chelsea was disallowed in controversial fashion - but the reason behind this has now been revealed.
The midfielder struck a rocket of a free-kick past Robert Sanchez in the 13th minute, beating Chelsea's wall in the process, but Marc Guehi's actions were deemed to be unlawful.
The Palace defender shoved Chelsea's Moises Caicedo to allow Eze's shot to beat the wall. However, this was not what landed him in trouble.
It was the fact that he was within 1m of Chelsea's wall before the ball was in play, which attacking players are not allowed to do.