The Frenchman scored his first Premier League goal this season in the Gunners' 3-1 away win against West Ham United on Saturday.
"Van Persie is now gone, there are many expectations about me," he told RMC.
"It took me a little time to adapt. But I know my qualities, and I will continue like this, hoping there are plenty of other goals that will come.
"It is clear that this goal [against West Ham] is important for me. Especially before the international break, it gives me confidence, even if I had been decisive four times before."