The 24-year-old swapped the Bernabeu for the Groupama Stadium for a reported €8million during the summer and he has made a flying start to life in Ligue 1, netting six goals in eight appearances to date.
Mariano's impressive form has led to suggestions that he could return to Real during the January transfer window, but the Spaniard admits he does not know whether there is a buyback option in his contract and he is nevertheless happy at Lyon.
"I signed for five years with Lyon but I don't know if Madrid have any purchase option," Mariano told Onda Cero and Radio Marca. "I'm really pleased with how things have started. The French league is very physical and I've learned a lot in the last few matches."
The forward went on to reveal that he had a number of transfer options during the summer, but Real boss Zinedine Zidane convinced him that Lyon would be his best choice.
He added: "I had a few offers and Lyon made a strong bid for me. [Alexandre] Lacazette left a space in attack and Zidane recommended I come here. He advised me that it'd be a good option."