The Gunners were holding a 1-0 lead courtesy of Leandro Trossard’s 83rd-minute strike before the hosts believed they had snatched a vital stoppage-time equaliser. Substitute Callum Wilson powered home a finish in a crowded penalty box from a corner.
However, a lengthy VAR review saw the goal disallowed by referee Chris Kavanagh, with Arsenal goalkeeper David Raya deemed to have been fouled by West Ham forward Pablo.
Cann has since spoken out on BBC Radio 5 Live about how such an incident in east London could be prevented, putting forward a potential rule change.
He said: “I think there is too much skirmishing generally at corners anyway. My idea that I have been saying for three years now is that I believe attacking players shouldn’t be allowed in the goal area before the corner is taken, so that would give natural separation between defenders and attackers and it would stop the intermingling before the ball is in play.
“You can’t give a defensive free kick or a penalty if the ball is not in play, so it would stop this constant pushing and grappling at corners if we separate the players.
“It is a simple law change for attackers to have to start outside the goal area and it would avoid these situations.”
Mikel Arteta, meanwhile, has heaped praise on the officials at Sunday’s match following the hugely significant incident.
The 44-year-old said: “It was a very brave call and consistent with what they’ve been talking about all season. When I have to be critical, I have been.
“This time I have to praise them, at least for giving the option to a referee to decide, away from the lights and the chaos, to give clarity to him to make the right call.”
The Spanish boss has acknowledged the weight of the decision with Arsenal chasing a first Premier League title since 2004 and West Ham battling to stave off relegation.
He added: “When you look at it, it is an obvious foul, a free kick, and the goal has to be disallowed. So congratulations, because they made a big call in very, very difficult circumstances.
“I’ve now realised how difficult and how big the referee’s job is because you’re talking about a moment that can decide the history, the course of two massive clubs that are fighting with their lives to achieve their objectives.”
The Gunners now require just two more victories to be crowned Premier League champions.
Meanwhile, the Hammers’ top-flight survival is no longer in their own hands, as Tottenham now have the opportunity to open up a four-point gap when they welcome Leeds on Monday evening.