According to the Daily Star, Arsenal's number one defensive target is Barcelona's Samuel Umtiti.
However, the World Cup winning defender is set to cost north of £35 million, which would use up most of Arsenal's summer budget.
As a result, the Gunners are reportedly stepping up their interest in RB Leipzig's Dayot Upamecano.
The 20-year-old is highly rated and Arsenal believe he could freshen up a declining backline.
Arsenal had scouts watch the Frenchman as he played 71 minutes for the France Under 21s in a 3-0 win against Belgium.
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