have signed Tiemoue Bakayoko from Monaco on a five-year deal, the Premier League champions have announced.
The once-capped France international, 22, is reported to have cost the Blues around £40m following his superb season in Ligue 1.
Bakayoko helped ASM win their domestic title and reach the semi-finals of the Champions League; he played 51 games in all competitions, scoring three goals.
An all-round central midfielder, Bakayoko is expected to partner N'Golo Kante at the heart of Antonio Conte's 3-4-3 system, with Nemanja Matic set to depart Stamford Bridge this summer as his game time will now be limited.