Arsenal have one small concern about summer signing William Saliba, according to reports.

The 18-year-old was instantly loaned back to Saint-Etienne after the two clubs agreed upon a transfer.

The Athletic says the Gunners were concerned about the centre-back's 'groin strength' when he first arrived at London Colney.

Despite those qualms, the club are generally happy with Saliba as a prospect and are looking forward to his return next season.

The two clubs are in constant contact over the £27m signing, who has made three appearances for the Ligue 1 club this season.