Arteta has demanded more from Willian after he broke his Arsenal goal duck, while admitting the club "haven’t managed to get the best out of him".
Willian has struggled since joining Arsenal on a free transfer last summer, having previously established himself in the Premier League at Chelsea.
The 32-year-old hadn't scored in his first 36 games across all competitions for the Gunners, but finally opened his account in a 3-1 win over West Brom on Sunday - much to the relief of his manager.