Saka came off at half-time, while Martinelli was taken off less than 20 minutes later.
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"Bukayo was feeling sick and he wasn't feeling right so we decided to take him off and bring Fabio in," manager Mikel Arteta explained after the match.
He then added: "We had a little issue with Gabi Martinelli. He had a little cut in his foot. We need to see how it is."
Both players are expected to be fit for the club's coming Champions League and Premier League games.