Arsenal has performed badly of late and has failed to win a game in the last four outings.
Their impressive start from mid-Dec to January seems to be over and the Gunners have started to produce awful results and their season hangs on the balance as they fight to turn results.
Arteta has an injury-hit squad and the manager was forced to make an unpopular decision ahead of the Sheffield United game.
Fans have will be hoping the introduction of the Brazilian will vital to reviving their season and be of massive help in getting the maximum points.
Martinelli will have to seize this chance and prove himself to the boss and this might be the turning point of his Arsenal career.
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