Chelsea development chief Joe Edwards was delighted seeing more academy graduates make significant progress this season.
Edwards told chelseafc.com: "To see three players involved so often in the Premier League and Europa League is a real motivator for us as staff, but particularly for the players because it shows there's a way there if you're good enough and you put the work in.
"We've also reflected on last season's group and how well they've done this season – Reece James and Trevoh Chalobah playing a whole season in the Championship, and Callum kicking on both at Chelsea and with England. That's a great measure of the work we did last year with those boys and it's a great source of motivation for this group.
"Progress will happen at different rates - some of them will consolidate with another year with the development squad, some will go out on loan and try to do what Reece, Trevoh, Mason and Fikayo have done, and others will hopefully keep getting closer to the men's first team squad. There might be no trophies this season but there's certainly been a lot of fantastic achievement and progress from Chelsea Academy players."