France youth international Tlemcani spent just over two years with Paris FC and began training with the first team when he was 15.

"It is a new spotlight for the development of the capital club, who allowed the young Sami Tlemcani to join one of the biggest European clubs in recent years," a Paris statement read.

He becomes the second keeper to arrive at Stamford Bridge since the end of the 2019-2020 season, with Edouard Mendy having been signed from Ligue 1 side Rennes.