The Gunners trail AC Milan 4-0 after the first leg of their last-16 tie - with two of the goals coming from the Brazilian forward.
Former Manchester City star Robinho said: "At City, I never had much luck but I've shown what I can do with Milan and I'm determined for another good day.
"Arsenal have improved since we beat them but it's almost impossible for them to turn this tie around.
"We were superior in the San Siro - 4-0 was a poor return. Robin van Persie is a great forward but he couldn't influence things.
"I don't think he'll play as well against us as he has in his last few league games."