Reports on social media said antisemitic chanting had come from the section of Groupama Arena housing travelling Chelsea fans at Vidi game.
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The 17-year-old striker, on the bench for Jose Mourinho's senior team for the Champions League defeat to Valencia, stole the show in a 4-3 win.
The alleged chants were heard on a train between Falmer and Brighton at around 4 p.m. on Sunday, Dec. 16.
Arsenal will face Belarusian side Bate Borisov in the Europa League round of 32, while Chelsea have been drawn against Sweden's Malmo.
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The words and actions of match-going Chelsea fans have come under the microscope in recent days following two separate incidents.
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"If UEFA take action we could get bans, we could have empty grounds. Roman [Abramovich] could even leave the club. Where does this end?"
"Support for a club should never include excessive aggression or discrimination towards the opposition," the Premier League said on Friday.
Chelsea are facing the prospect of a UEFA investigation into alleged antisemitic chanting by supporters during Thursday's match against Vidi.
Chelsea fell behind in their Europa League trip to Vidi, but Olivier Giroud came off the bench to score an exquisite free kick and salvage a draw.
Table-toppers Chelsea drew 2-2 at Vidi in their final Group L in the Europa League on Thursday.
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