Millwall are in talks with Shaun Cummings, Jimmy Abdou and Fred Onyedinma over new deals.
The trio are out of contract this summer, and Lions boss Neil Harris is keen to keep Cummings and Abdou, who both played a vital part in the promotion run-in last season.
Onyedinma has made a decision on his future, but is yet to announce anything publicly.
Influential midfielder Shaun Williams, who is keen to stay at the Den, has been offered a new contract.
Meanwhile, Millwall stalwart David Forde has left the club after making 339 appearances during his eight-year spell.
Joe Martin has also been released following an unsuccessful second season with the Lions. The left-back played 28 times last term.
And loan players Jake Cooper and Jed Wallace have returned to their parent clubs Reading and Wolves, respectively.
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