It's been revealed Arsenal directors asked after Sarr last week following their Europa League first-leg defeat.
Pires told Sport24: "Ismaila Sarr? It would not hurt Arsenal to sign him, but I do not know his price (laughs).
"He has the profile to evolve at the Gunners. He would adapt quickly to the way of play wanted by Unai Emery. He is a wide player, a dribbler who runs fast and is able to score. I appreciate him very much.
"Rennes has good players. That's why I'm not surprised by their performance in the first leg."