Barry Maguire, Yusuf Hussain, PJ Morrison and Harry Robinson have signed new deals with the club.
The young quartet have agreed to stay for the 2020/21 campaign, extending their stays at Fir Park.
Maguire has played 14 times for the Steelmen, having made his debut against St Johnstone in April 2018.
The 22-year-old, together with Hussain and Morrison, are products of the club’s youth academy. Robinson signed earlier in 2020, having left Oldham Athletic.
“We have secured the four young players on contracts and I feel they will boost our squad,” said manager Stephen Robinson.
“Players know if they are good enough, they will get chances here, no matter what age they are.
“All of them have good attributes to hopefully keep improving, as well as pushing the players in front of them.”