Chelsea have handed new contracts to reserve trio Nathaniel Chalobah, George Saville and Adam Phillip.
England Under-19 international Chalobah was on the bench against Wolves on Monday and has now signed his first professional contract with the Blues.
The defender only turned 17 last month and has committed himself to Chelsea until 2014, while team-mate Saville has committed for a further year.
The 18-year-old has played in all 13 of the side's reserve league games this season and has signed a three-and-a-half-year deal.
Former England Under-17 international Phillip is currently out with a long-term injury, but the 20-year-old has extended his contract by a season, with his previous deal due to run out in the summer.