The Brazilian has struggled for minutes this season and has not made a Premier League appearance since August 22.
The lack of European football for Arsenal this season has hampered Martinelli’s chances, who had to settle for the Carabao Cup.
Arteta explained that the competition for places in the front row made it more difficult for the 20-year-old.
But when asked if he could loan Martinelli in January, Arteta replied: “No, I’m very happy with him and we’re not thinking of something like that.
“He played a few games, he started against Brentford and he also started against Chelsea.
“Unfortunately he got injured last week, it’s a minor injury but we don’t know if he will be available for Monday but we have a lot of confidence with Gabby and we have to find the right space for him to grow up. . the squad.
“If you look at the number of games he’s played, it’s obvious that the injuries he suffered were big setbacks with him.
“We sometimes forget his age, what he did and where he is and we have to try to help him also to maintain this balance because you can generate frustration which comes, in my opinion, from an unrealistic diagnosis and you need time to do that. “