The former defender thinks a top-class centre forward could have the impact Mesut Ozil's signing had on the side two years ago.
While the veteran keeper is being deemed as a major coup for Arsene Wenger and one that can push his side closer to the title, it is believed that they need more additions if they are to be true contenders.
And Keown believes one of them will be a proven striker, should they be available, although he anticipates Olivier Giroud having a big season next year.
“I think Arsenal’s priority will be to sign a top striker, as a marquee signing can feel like you’ve landed a psychological blow against your opposition,” he answered in the Daily Mail Q&A.
“They will probably be looking for someone with different qualities at the moment. Someone with more pace and power. “[But] I still feel Olivier Giroud will play a major part this season. He scored plenty of goals last season.”
Same effect as Ozil
The former defender also believes that the signing of a big-name goal-getter could have the same impact that Mesut Ozil’s signing had back in 2013.
The Gunners had started the season with a poor showing against Aston Villa, with Paul Lambert’s side comfortably defeating them at the Emirates. That led to Wenger moving for the German and securing him in big-money move from Real Madrid.
That signing saw Arsenal take off as everyone raised their game courtesy of the new recruit, with the FA Cup being secured at the end of the season as a result. And Keown believes signing a striker this summer would have a similar effect.
“Only Wenger knows whether Arsenal will sign a new striker or not, and he may well be working towards something at this moment,” he added.
“But think about two seasons ago when Arsenal lost the first game of the season against Aston Villa at home. Wenger went out and bought Mesut Ozil afterwards, and making that marquee signing saw Arsenal take off.”