Mario Pasalic will spend the 2015/16 season on loan at Monaco.
The 20-year-old Croatian midfielder, who signed for Chelsea from Hajduk Split last summer, will join the Ligue 1 side as he continues his development.
Pasalic spent last season on loan with Elche in Spain’s top flight, making his senior international debut against Cyprus in September.
The announcement is made on the same day we agreed terms with Monaco for the season-long loan of Radamel Falcao.