The Sky TV pundit said: "For me, those two aren't in the same league as Van Persie. I was disappointed in both of them."
But Gunners boss Wenger insists the summer signings will come good.
The Frenchman rapped: "I have worked for 30 years on the football pitch, every day. I know what it is to improve a football player.
"What it is to go out morning and afternoon and try to make a player out of somebody. Not everybody can say that.
"Of course they are quality players.
"I do not listen too much to what people say - I try to see if it is exaggerated or not."