That's a timely defensive boost for Unai Emery, who is now without his captain Laurent Koscielny and has not yet landed a new centre half with just weeks to go until the new season.
The Gunners have already signed Gabriel Martinelli and are pursuing another youngster, William Saliba.
Granit Xhaka is in pole position to replace Laurent Koscielny as the Arsenal captain after the Frenchman refused to attend the club's pre-season tour. We have a clear idea to sign players to help us with quality and in the positions we need.
Emery called for calm while the search for signings goes on, telling reporters: "We are being patient and calm because we really want to sign players who can help us with a big performance, and also because we think in the team we have very good players and young players".
It's claimed Arsenal are battling with Tottenham to land the 22-year-old as Unai Emery looks to splash the cash.
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Defenders Diego Godin, Filipe Luis and Lucas Hernandez have left, while Brazilian pair Renan Lodi and Felipe has already signed. The club scouted Norwich City right-back Max Aarons as Trippier's potential successor but was put off by his £20m valuation.
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"We are waiting for two, three, four players to help us and also with everybody creating a new way with a lot of positive things we worked on previous year".
"We have players with the capacity [to be captains]". We need, really, that they will come with a big performance.
"Our target is to achieve three, four players to really improve our team and squad now", Emery said.
However, Emery has moved to reassure fans, insisting they are seeking out expensive players to sign.
"At the moment Koscielny has a contract with us but we'll speak with the club and him about if he will continue or not".