A surprising win for Lens over Arsenal in the last round of games has thrown wide open a group also containing PSV Eindhoven and Sevilla.
Arsenal will be looking to bounce back from that loss — its only defeat in 13 matches this season in all competitions — when the English team travels to Sevilla.
Arsenal manager Mikel Arteta has to weigh up whether to bring back goalkeeper Aaron Ramsdale, who has been dropped to accommodate summer signing David Raya.
Raya has been shaky for Arsenal so far and made a couple of big mistakes in the 2-2 draw at Chelsea in the Premier League, including letting a cross go over his head and into the net for one of Chelsea's goals.
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