Luke Steele, Jayson Molumby, Ryan Woods and Mason Bennett have all left Millwall and returned to their parent clubs at the conclusion of the 2019/20 campaign.
The quartet all spent time on loan at The Den during the year, and have now departed in preparation for the 2020/21 season.
Steele made just two appearances for the club, both in the Carabao Cup at West Bromwich Albion and Oxford United, but provided stiff competition for Bartosz Bialkowski throughout the season.
Irishman Molumby appeared 40 times for The Lions, impressing with fine display after fine display, and capped off his campaign with his first goal for the club in last weekend's penultimate League fixture at Queens Park Rangers.
Woods, 26, made 18 starts in the heart of Millwall's midfield since making his debut at home to Reading in January, whilst Bennett's explosive pace and power was clear for all to see in his nine matches for Millwall, scoring two goals - one against Swansea City and the other in SE16 against Blackburn Rovers.
You can hear Gary Rowett's thoughts on the departing loanees by clicking here.
The club would like to place on record its thanks for the efforts of the quartet throughout 2019/20.