Merson wrote in the Daily Star: "If Arsenal fail I wouldn't be surprised if Wenger walked away. I don't think he would feel like he has a duty to stay on and put it right next season.
"That's his trophy, finishing top four. If he doesn't get it he might think enough is enough. Paris Saint-Germain would have him like a shot, wouldn't they? Or Monaco.
"I know Arsenal could end up in a play-off with Chelsea for third if results go the right way tomorrow - the Gunners could even nick third outright if they win and Chelsea lose at home to Everton tomorrow!"