Arsenal are reportedly keeping tabs on Lille defender Gabriel.
The Gunners have leaked 27 goals in just 18 games in a dismal first half of the season that saw Unai Emery sacked.
New boss Mikel Arteta has taken charge at the Emirates and is keen top bolster his backline in January.
Arsenal have reportedly made contact with Napoli in a bid to sign highly-rated centre-back Kalidou Koulibaly, although they could be priced out of a move.
It has emerged that Brazilian defender Gabriel is also a potential target, according to The Athletic.