The 18-year-old has been a revelation for the Gunners after joining from Ituano in Brazil last summer, scoring 10 times in 26 appearances.
Arteta has planned to use Martinelli as a central striker, but the Brazilian has other ideas.
Speaking to Spanish outlet Marca, he said: "I really like playing on the left end. It is my favourite position."
With that being said, Arteta is still using Martinelli as a fringe player and it will take some feat to nab a regular spot in his side.