Lopez moved to San Siro in January on a six-month loan with a view to a permanent deal at the end of the season.
The Catania-owned striker has so far made only seven appearances for Milan, scoring two goals in the process, but he remains hopeful that the Serie A champions will exercise their option to buy at the end of the season.
"Milan are very happy with his displays after he scored very important goals," Andrea D'Amico told Radio Sportiva.
"A return to Catania? It is possible, given that he is on loan at Milan. However, there is an option to buy, and Maxi is working to convince the Milan directors to bet on him for the next season."
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