Chris Sutton believes former club Celtic will be "absolutely stuffed" if they do not sign "three or four players" before the end of the January transfer window.
Interim boss Martin O'Neill, who managed Sutton at Celtic in the early 2000s, dropped Scottish Premiership points as Celtic manager for the first time this season in Sunday's 2-2 draw at Hearts.
January loan signings Julian Araujo and Tomas Cvancara started at Tynecastle, with the latter setting up Celtic's second goal.
"Celtic, at this moment in time, I think they'll finish third," Sutton told BBC Radio 5 Live’s Monday Night Club.
"They've brought one striker in on loan. If Celtic do not add three or four, I think that they are absolutely stuffed.
"A lot has been made of Hearts and their recruitment and whether they will have a wobble.
"It seemed like [Sunday] would be the toughest test for Derek McInnes and his Hearts team and in truth, I thought they bullied Celtic, especially in the middle of the park.
"I thought they got Celtic playing the game that Hearts wanted. Now, it's just maintaining it for Hearts. Hearts were the much better team."
