Arsenal legend Ray Parlour believes the Gunners need to bring in a centre-back and a midfielder in the summer transfer window.
The Frenchman has the services of his compatriot Laurent Koscielny, Per Mertesacker and Gabriel Paulista as the first choice centre-backs in the squad, along with Calum Chambers. The Brazil international has struggled in the Premier League, while the World Cup winner cannot continue for long.
"For me, bringing in another centre-half is key. Per Mertesacker's got that little bit older and Gabriel's not really settled in yet. Maybe he can get better once he's more used to the demands of the Premier League but certainly they need another one in there," Parlour told Sky Sports.
Granit Xhaka arrived at the north London club Borussia Monchengladbach and was Arsenal's first summer signing. Wenger allowed Mikel Arteta, Tomas Rosicky and Mathieu Flamini to leave the club as free agents, while Jack Wilshere has struggled with injuries in the past few seasons.
Parlour believes bringing in another midfielder will further strengthen Arsenal's squad, despite Xhaka's addition. He also stressed that Wilshere can be the "impact" player, if he manages to keep himself fit.
"They could also do with another midfielder. They've lost Mikel Arteta, Tomas Rosicky and Mathieu Flamini and although none of them played on a regular basis last season, you need a big squad of players," he explained.
"Granit Xhaka, who they've brought in from Borussia Monchengladbach, is a good player. He had a good Euro 2016. He's efficient and good on the ball so he'll fit in well at the Emirates. However, they still could do with maybe one more in there.
"I think they've got a very good squad. The age of the squad is very good and with the likes of Aaron Ramsey, who has had a good Euro 2016, Sanchez, Ozil and Jack Wilshere, they've got a good group of players. Hopefully, Wilshere can stay fit and have an impact this season."