Arsenal have triggered the clause in William Saliba's contract to extend his current deal until June 2024, football.london understands.
Saliba has immersed himself as one of Mikel Arteta's stand out performers this season in his breakthrough campaign in north London. The defender returned to the Emirates Stadium in the summer after being loaned to Marseille last term and is now a key member of the Gunners' back four.
The club have triggered the clause in the 21-year-old's contract to ensure his deal extends a further 12 months.