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Gabriel Martinelli put Mikel Arteta's side ahead after just seven minutes and it hardly looked back from that point.

Kai Havertz and Gabriel Magalhaes added a second and third respectively before half-time as the visitor did its best to kill the game as a contest.

Things got a little more competitive when Goncalo Inacio pulled one back for the host within two minutes of the restart, but a Bukayo Saka penalty in the 65th minute soon quelled any chance of a comeback.

Leandro Trossard got the fifth eight minutes from time after coming off the bench to help Arsenal move above Sporting into seventh place in the 36-team league. Sporting, meanwhile, is one place back on goal difference.

Arsenal's 5-1 victory away to Sporting was its biggest away win in the Champions League for 21 years.

The result matched that of the scoreline it managed against Inter Milan in 2003.

It is a result that is made more impressive given that it is Sporting's first defeat at its own ground in 14 matches in all competitions, and the only home game it has failed to win this season.