In late November/early December 2012, Planas played his first two competitive games with the first team: he made his debut in a 3–1 home win against Deportivo Alavés in the round of 32 of the Copa del Rey (6–1 on aggregate), featuring the last 20 minutes of the match in the place of Adriano. The following week, as the "Blaugrana" were already qualified as first in their UEFA Champions League group, he started against S.L. Benfica in a 0–0 draw, also at the Camp Nou.