West Coast's star midfielder Andrew Gaff, the player at the centre of the season's most contentious on-field incident, has called for the introduction of the send-off rule.

Gaff said there was no question he would have been given a red card for his head-high strike on Fremantle's Andrew Brayshaw in round 20 - which saw Brayshaw suffer facial injuries and Gaff suspended for eight matches by the AFL Tribunal - if a send-off rule existed.

"I think the red-card system is the right thing to do,'' said Gaff, whose suspension cost him the opportunity to play in West Coast's premiership and who last weekend decided to stick with West Coast, rather than take up a huge North Melbourne offer.

Andrew Gaff at the tribunal after his clash with Andrew Brayshaw. Credit:AAP

"I have no doubt I would have and should have got a red card that day and therefore I wouldn't have been out there,'' the 2018 All-Australian midfielder told Fairfax Media.