Kasey Palmer, a former Charlton trainee, posted the image of him signing the Chelsea deal on Instagram surrounded by his family.
The England under-17 international commented: ''Happy to have signed my first professional contract at Chelsea with the people that mean the most to me ! Can't think of a prouder moment.''
The youngster, who joined from Charlton Athletic's youth team in April 2013, caused a stir when changing academies and left his former club 'angry' at the loss of a potential future star.
The 17-year-old is expected to play a big part in Chelsea's under-21 development squad next season after a cameo appearance against Manchester United in the U21 Premier League final last season.
George Brady, who also posed with his family at the contract signing, is another player that could look to player a major role in Chelsea's under-21 development squad next season after ending the season as the Chelsea under-18 captain.
The young defender commented: ''So special to have my family next to me today, it's not everyday you get to sign a professional contract, hard work pays off! Now can't wait to start playing again #cfc #chelsea #family''
Chelsea did well to land the player in 2012, aged just 15 at the time, as both Manchester clubs, Arsenal and Tottenham were all said to be monitoring the starlet who joined from French side Cannes.
Already a physically excellent defender, if he carries on improving at the same rate then he could seriously look to challenge for a first-team spot in the Chelsea side in the future.
Domonic Solanke, who posed at the side of his mother during the signing, is said to be a player that is really exciting the Chelsea coaching staff and could look to challenge the likes of Isaiah Brown and Patrick Bamford in the near future as Chelsea's future striking star.
The youngster commented on his Instagram post: ''Nothing like making your mother proud. Signing. #CFC''
One of the heroes of both Chelsea's FA Youth Cup and England under-17's European Championship success last season, the youngster is making huge strides in the Chelsea ranks and could look to be the talisman in a big year for the under-21 side next season.
He is certainly a player Chelsea supporters will want to keep an eye out for in the next few years.
Ruben Loftus-Cheek, whose deal we reported five days ago, is another player that used Instagram to announce his deal to supporters and could look to play a huge part for the Blues youth team next season.
Although a lot is expected of the 18-year-old in the future, the talented teenager will be no doubt be keen to just get his head down in training and listen to what Mourinho thinks would be the best course of action for him in his short-term future.
If Lewis Baker and John Swift are loaned out for the upcoming season then the door would be left open for Ruben Loftus-Cheek to become the star man in the development side and look to spread his reputation around Europe. However, due to his rate of progression, it wouldn't be surprising to see the talented teenager loaned out himself in order to get competitive first-team football.