However, the ex-Borussia Dortmund man has made just 44 league appearances for Arsene Wenger's side since arriving in 2006.
The 28-year-old last played for Arsenal in January 2008 and missed the whole of last season due to injury.
But he has now confirmed he expects to be fit and firing again in 2009/10.
“I think I will be back in the autumn," he told Czech newspaper Sport.
"According to my fitness coach I could have been playing at the end of the season as he thought my fitness was okay.
"I think it was obvious from the training that I was ready to play, if not for the 90 minutes.
“But the club decided not to play me. They saw that I was okay, but maybe they did not want to take the gamble.
"Until I play in a league match I will not be able to tell what my chances are, but when it comes to fitness alone I am in better shape than when I came to Arsenal.”
And Rosicky says he is looking forward to competing with the likes of Samir Nasri, Theo Walcott and new star Andrey Arshavin for a starting berth at the Emirates Stadium.
“I am missing the competition. Playing alongside Cesc Fabregas and Theo Walcott makes you feel comfortable and I think that I have been out for a while," he said.
"Now that I have recovered, I am a new option for the manager. We have a strong team capable of moving mountains in all competitions.”
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