Arsenal's opening goal in Sunday's 1-1 draw with Tottenham Hotspur has sparked a debate over the offside rule, with former officials Howard Webb and Graham Poll backing the call to allow it to stand and ex-referees' chief Keith Hackett saying it should have been disallowed.
Arsenal took the lead when Spurs' Kevin Wimmer headed into his own net, but Alexis Sanchez was standing ahead of the final defender when Mesut Ozil took the free kick.
The offside rule stipulates that it is an offence for a player to stand ahead of the second-last opponent when the ball is played if they become active by: touching the ball; preventing an opponent playing the ball by obstructing their vision; challenging for the ball; clearly attempting to play the ball; or making an obvious action that clearly impacts on the ability of an opponent to play the ball.