Chelsea on Friday announced transfer deals for two players, Mamadou Sarr and Leo Castledine.
In a statement on their website, the Premier League west London club said Sarr had joined French Ligue 1 side Strasbourg on a season-long loan.
Sarr, who was included in Chelseas squad for the 2025 Club World Cup, joined the Blues from Strasbourg in June.
The centre-back, a France Under-20 international, made his Chelsea debut in their victory over ES Tunis and featured in every match-day squad en route to the Blues being crowned world champions.
Castledine, meanwhile, will spend the 2025/26 season on loan with Huddersfield Town.