The forward scored in the 3-2 win over Manchester City on Sunday.
Arsenal manager Arsene Wenger
The striker was in fine form on Sunday as he bagged a goal in the 3-2 win over Manchester City.
He is hoping to enjoy a stronger season than he had last year after he managed just five goals in the Premier League despite Wenger giving him the chance to prove himself in the central striker role he has longed craved.
Arsenal's Theo Walcott scores their second goal
He may feature there yet again this season given the Gunners failure to sign the new striker this summer, and Wenger says he is backing him for a strong season.
“I’ve said many times that we will get a strong season from Theo Walcott because he got hit hard and I saw how he responded,” he told the club’s official website.
“He went through a very tough time not being at the Euros with England, and I observed him, saw how he responded and I am convinced that he will have a great season.”
Arsenal's Theo Walcott celebrates scoring their second goal
It remains to be seen if Walcott can have the strong season that Wenger is predicting, with the pressure very much on for him to prove himself.
His performances came in for stern criticism last season as they fell away in the title race during the second half of the campaign, with many suggesting it was time for the Gunners to move him on.
A strong showing in this season will quickly dispel those doubts though, and will also help Wenger justify his failure to sign a striker should he not do so before the end of the transfer window.
Arsenal manager Arsene Wenger before the match