On-loan from Chievo Verona, Maxi struck twice against his parent club.
Ventura said: "Maxi Lopez could stay here next season, but he must decide if he wants to really be a protagonist again. I do believe he's taken the right path.
"I compliment my squad yet again, as they've done great things that could've been amazing. The Europa League isn't mathematically impossible, but we'd have to get everything right and hope the others fall."