Chelsea Club announced that a contract was signed with a 19 -year -old stopper until 2033.
In the British press, it was claimed that the transfer was realized with bonuses with approximately 15 million euros.
Sarr, who started his career in Lyon, was transferred to Strasbourg at the beginning of last season.
French National Team’s lower age categories of young footballer, the remaining season Strasbourg jersey 28 matches appeared.