Benzia came on as a 66th-minute substitute for Bafétimbi Gomis in the 2012 Trophée des Champions against Montpellier at New Jersey's Red Bull Arena on 28 July, and scored in Lyon's penalty shootout victory after a 2–2 draw. On 22 November, he scored his first professional goal to open a 1–1 draw at Sparta Prague in the group stage of the UEFA Europa League. He scored again in the competition's next game, a 2–0 win at the Stade de Gerland against Hapoel Ironi Kiryat Shmona, but did not find the net again for the rest of the season.