The teen will move to Barca when his TFC deal expires this summer.
But Venditelli, who has been the agent of Chelsea defender Kurt Zouma, told France Football: "There is a sporting risk, because the playing time will be reduced, even if the recent example of (Matteo) Guendouzi at Arsenal shows that it can work.
"Zouma, I would rather have advised a less elevated orientation, a good compromise like Inter Milan. But we must also understand that when Chelsea or Barça comes knocking on the door, it is very complicated for a player to say no..."
Zouma is this season on-loan with Everton.