Arsenal must set their sights on Napoli centre-back Kalidou Koulibaly when the transfer market reopens, according to former midfielder Emmanuel Frimpong.
Unai Emery's men have had a mixed start to the 2019-20 campaign, recording three victories along with two draws and a defeat in the Premier League.
The Gunners sit fourth in the table ahead of Monday's clash with Manchester United, but they have looked extremely vulnerable at the back, conceding 10 goals in total.
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David Luiz has failed to convince in the heart of the defence since his £8 million switch from Chelsea while the likes of Sokratis and Sead Kolasinac continue to underwhelm.