Sunderland manager Sam Allardyce
Merson, speaking to the Daily Star, is confident that Allardyce will not pick players purely on reputation.
He believes a trio of Manchester City, Liverpool, and Arsenal players are most likely to be under threat.
Merson said: "Too many times recently the players have run the team. They won’t get away with it under Big Sam.
"And players like Raheem Sterling, Jordan Henderson and Jack Wilshere should be worried because they might not get in his team.
"He won’t pick players who are out of form or unfit, and I think that’s a good thing. Some of them don’t deserve to be anywhere near it after how bad they were at the Euros."
England's Raheem Sterling
England's Jordan Henderson during training
England's Jack Wilshere during training
Jack Wilshere was a player who was incredibly fortunate to be picked for the European Championships, having missed nearly the entire season through injury.
Once at the Euros he contributed little, failing to perform well in the match he did play, while Jordan Henderson - who had two months out before the tournament started - was in the same boat.
Raheem Sterling was a different case entirely, with the winger simply not performing. Signed for £49 million a year ago, he was the most expensive player in the squad, as Merson points out - Allardyce will not take this fee or his reputation as reason to automatically pick him.