Four youngsters have signed new six-month deals to stay with Grimsby.
Midielder Ben Higgins and striker Danny North, both 18, have extended their contracts at Blundell Park.
And the 19-year-old duo of midfielder Paul Ashton and striker Danny North agreed similar deals, said the club's official website.
Chamberlain was loaned to Eastwood Town last season, Ashton featured for the reserves while Higgins and North were youth team regulars.