Alexandre Lacazette has decided to leave Emirates upon the expiry of his contract whereas Nketiah has been offered a fresh contract.
The Gunners are in the market for a lethal striker and Gabriel Jesus is currently on top of their wishlists.
Keown told talkSPORT: “For sure. You have to take players through the ranks. You want them to sign new deals. I’m not sure he’s going to play. In an ideal world, Arsenal will have someone else, an A-line striker, they will bring in.
“Nketiah did really well at the end of last season, but to play every week? Arsenal need to strengthen in that area, you could argue that cost them a Champions League position.
“You saw what their near neighbours did in the transfer market at the same time. It’s always the challenge at the start of every pre-season. Secure the players you want and protect players and get those players signed up first.
“Arsenal will need to do both, of course.”
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