Keown wrote in the Daily Mail: "Two things need to happen to Luis Suarez. First, his name must be taken off the PFA Player of the Year shortlist; second, he needs to be offered help. There are boundaries in football you don't cross, and biting someone is one of them.
"We cannot have that in our game and the PFA cannot risk him being voted player of the year. It sends out totally the wrong message.
"I've been a part of stamping, pinching and other niggling on a football pitch, but what Suarez did was cowardly and something only a child would do.
"You can't risk copycat behaviour at grassroots level so the PFA have to make a big impact."