Chelsea have confirmed that 18-year-old defender Nathan Ake has signed a five-year contract extension with the Blues.
The versatile Dutchman, who is comfortable playing in defence and midfield, has only made six senior appearances for the Blues - but has impressed everyone at the club with his mature displays.
Ake joined the Premier League club from Feyenoord in 2011, and made his league debut against Norwich City - still aged 17 - last Boxing Day.
Former interim manager Rafael Benitez also used him on two occasions in the Europa League - and even named him as a substitute for last season's final - and the Netherlands U19 international has passed every test of his short career with flying colours.
"I'm very happy that Chelsea is rewarding me with a new contract for my effort and development the last years," Ake told Chelsea's official website. "I would like to thank everybody at the club for everything they did for me. Thanks to them I have come so far. I won't let them down and will keep on working as hard as I can."
Ake is a centre-back by trade but showed his invaluable versatility and potential last season by making his first Premier League start for Chelsea (against Everton) alongside club legend Frank Lampard in the Blues' midfield.
How much first-team football he gets next season under Jose Mourinho is unclear, but the Portuguese coach will be delighted to have tied down one of the club's most promising talents to a long-term deal.