Chelsea have exercised an option - two days after his 21st birthday - to extend Scotland midfielder Billy Gilmour's contract until summer 2024.
His previous four-year deal was due to end next summer.
Gilmour, who has 14 Scotland caps, is currently with the national squad preparing for Tuesday's Nations League Group B1 game in Armenia.
Having made his Chelsea debut in August 2019, Gilmour became a permanent fixture in Frank Lampard's squad during the 2019-20 campaign.
However, his progress at Stamford Bridge was interrupted by the Covid-19 pandemic and injury, he found it difficult to break into the team under new manager Thomas Tuchel and was sent to Norwich to gain further top-flight experience.