The 18-year-old is one of the youngsters from Chelsea’s academy who has benefited from Frank Lampard’s appointment as manager.
Anjorin made his debut for the Blues earlier in the season against Grimsby in the EFL Cup and he followed that up by appearing in Chelsea’s last game before the Premier League season was suspended in March because of the coronavirus pandemic, playing the final 20 minutes in the 4-0 win over Everton.
‘It’s a brilliant feeling,’ Anjorin told Chelsea's official website after agreeing a new deal.
‘I’ve been at the club since I was six years old so to get to this stage and then be offered another five-year contract on top of that is amazing.
‘I had no hesitation but to take it straight away because to play for the club I always dreamed of playing for is really special for me.
‘It’s been a really crucial season for young players here,’ Anjorin added.
‘Frank, Jody Morris and Joe Edwards have taken us on board and really committed themselves to bringing young players through.
‘It’s been really important to have those familiar faces around,’ he said of the former Academy coaches who are now working alongside Lampard.
‘It’s easy to talk to people and be around the first team building more because you’re welcomed in.
'Hopefully I can try to carry on being a part of that as long as I keep working hard and impressing the coaches.