The 29-year-old scored twice during the Gunners' 2-0 win over Fulham on Saturday, and he says that he is in good form after recovering from his ankle problems.
"I'm doing well at the moment," he told the club's official website. "In the last few games I've been getting better physically and my confidence has been growing. I hope this continues from now until the end of the season.
"I had a bit of a bad time with my ankle problems and missed a few games but I hope to put that behind me and get back to my best in order to help the team to achieve as much as possible."
Arsenal are currently top of the Premier League table, one point ahead of second-placed Manchester City.