Czech Republic national-teamer Tomáš Kalas will be spending the whole of the 2017-2018 season on loan at Fulham.
Chelsea have confirmed via their official webpage that the central defender and right back put pen to paper on a new four-year contract before he was farmed out on loan to the Craven Cottage outfit.
Kalas is returning to the Cottagers for a second spell as he spent last season on loan at the Championship outfit.
The 24-year-old has four appearances to his name for Chelsea's first team, and previously enjoyed loan spells at Sigma Olomouc, Vitesse, FC Cologne and Middlesbrough due to his lack of first team opportunities.
Super Eagles striker Sone Aluko, Dennis Adeniran, Tayo Edun and Elijah Adebayo are on the books of Fulham.