Dean Ryan believes Wasps' scrum could scupper their hopes of a top-four finish.
Dai Young's team moved up into a play-off spot on Sunday courtesy of a 29-15 win over Bath, a result highlighted by tries for Christian Wade and Chris Bell.
But former Wasps No. 8 Ryan - who has just been appointed as Scotland's interim forwards coach - has his reservations over whether the Adams Park outfit can make a sustained push for honours.
"Wasps played with a lot of width against Bath and they have a lot of pace so anything thrown out wide panics defenders," said the Sky Sports pundit.
"They have a good lineout, too, but I suppose the concern with them in regards to the top four is foundations: do they have the scrum to go on the road? Do they have the scrum to take on Leicester?
"I think they are forced into this 'hare'em, scare'em' game a little bit and need a bit more variety."
Erstwhile Wales wing Ieuan Evans was impressed by Wasps' dominant display against Bath and singled out countryman, fly-half Stephen Jones, for special praise.
"Bath had a lack of shape and so Wasps didn't maximise what territorial advantage they had," said Evans.
"But the tries they scored were well worked, especially Wade's, and they used the power carriers to create the space.
"In the second half Wasps began to take control and Jones at 10 was crucial to that."
Bath's hopes of a play-off berth now appear distant - they lie 10 points adrift of Wasps - and Ryan feels that rather than splash the cash on new recruits in the offseason, the West Country side must decide on a clear way of playing.
"Bath have ambition and will spend over the summer," he said. "But I'm not sure that's the fix.
"It has been three years talking about signings, but the key is generating a philosophy and getting the players in to play to it, and crucially that is at 10, a position that holds all the intellect of the game.
"Bath don't understand what their best attacking weapons are and just go left and right, left and right."