The goal was Martinelli's first in 15 months after a serious knee injury, and Arteta says he will continue to ease him into first team action.
He told reporters: "Of course, I'm delighted with him but I'm asking you to be patient as we have a lot players who are 19, 20 years old.
"They're compared with other players of similar ages at Premier League clubs towards the top end, but it's not common. Gabby is having the right path and the right development.
"He's got an incredible attitude and talent, and has his entire future in front of him. What we need to do is manage that and try to give him the right amount of minutes and the right games to develop and get better."
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