Celtic defender Kristoffer Ajer will have "alarmed" clubs looking to sign him this summer after his showing against Rangers.
The Norwegian didn't cover himself in glory during the 4-1 derby demolition at Ibrox as he was accused of ducking for Alfredo Morelos' strike.
The 23-year-old has been linked with a move away from Glasgow's east end this summer as he approaches the final year of his contract.
However, former Rangers midfielder believes Ajer's issues with the dethroned champions are deeper than just one game and clubs may be worried about splashing the cash.
Rae told Clyde 1 Superscoreboard: "You've got to try and block the angle and you have to try and engage a little bit and make your body bigger.
"For a player who has apparently been courted by Premier League clubs, obviously being Norwich who have just been promoted, that would be alarming for me.
"You want your centre-half to be there, take whatever it takes and it doesn't matter what part of the body it hits. It stings for a second, but to duck out in the manner he does, he doesn't actually give the goalkeeper a chance because it's hit that quick he can't react.
"On the plus side he stepped forward a couple of times, but you want your centre-half to defend first and foremost.
"He obviously bullies (Jack) Simpson for the equaliser. He wins it in the box, but you've got to win it in your own box. That's where it matters.
"That's been a key thing for Celtic this season at set-plays and he's been pretty much in that centre-half area throughout the season.
"i think defensively there are still question marks."
