Viktor Gyokeres scored his first Arsenal goal in a 3-0 victory against Athletic Bilbao.
Gyokeres headed Martin Zubimendi's searching cross beyond goalkeeper Unai Simon before performing his trademark celebration on his second Emirates appearance.
The striker, signed for £64million from Sporting Lisbon, was involved in the build-up to the second goal, finding Declan Rice who in turn picked out Gabriel Martinelli. Simon rushed out but was caught, allowing Martinelli to tee up Bukayo Saka.
In one of his final acts, Gyokeres saw another deft header tipped onto the woodwork, before his replacement Kai Havertz also got on the scoresheet.