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Last season's beaten semi-finalists got off to a winning start in the Basque country as they shaded a tight game at the San Mames stadium in the first of eight group matches. Mikel Arteta's side, chasing a first major trophy since 2020 and their first ever Champions League win, ground out their victory with a typically sturdy defensive display and their late goals.
Martinelli scored in the 72nd minute, 36 seconds after coming off the bench, before Trossard added a second after 87 minutes, each setting the other up. Athletic, back in the competition for the first time in 11 years, were on top in the early stages, buoyed by boisterous home support.
Bilbao's coach Ernesto Valverde lined up with an entire team of players making their Champions League debut, including talisman striker Inaki Williams but not his injured brother Nico Williams.
