Chelsea technical director Michael Emenalo believes new signing Tiemoue Bakayoko's experience winning a league title with Monaco means he will immediately improve Antonio Conte's first team squad.
The French midfielder has signed a five-year contract at Stamford Bridge after Chelsea prised him away from the French champions with a £40m deal.
Bakayoko was one of the breakout stars as a youthful Monaco side beat financial colossus Paris Saint-Germain to the Ligue 1 title and reached the semi-finals of the Champions League last season.
Despite being in the same age-bracket as home-grown midfielders such as Ruben Loftus-Cheek and Nathaniel Chalobah, who Chelsea have let leave the club this summer on a temporary and permanent basis respectively, Emenalo believes the 22-year-old is already good enough to upgrade Chelsea's squad.
“Tiémoué was outstanding as Monaco emerged as one of Europe’s best sides last season and we are delighted to welcome him to Chelsea,” said Emenalo.
“Despite his young age he already has plenty of experience as a French title winner and having competed in the latter stages of the Champions League, we believe he will add considerable quality to our squad.”
Bakayoko is Chelsea's fourth signing of the summer, arriving after defender Antonio Rudiger, goalkeeper Willy Caballero and 16-year-old defender Ethan Ampadu.
“I am very happy to be here and to join this great team,” he said.
“I have grown up watching Chelsea. Signing was the natural thing for me because it is a club I loved very much in my childhood. I am now looking forward to evolving under this fantastic coach and alongside so many great team-mates.”