The signings come shortly after two Australia internationals, Collette McCallum and Laura Alleway, penned deals to play for the Lady Imps next season.
England under 23 midfielder Hamilton was ever-present for the Belles last season, and after a string of impressive performances has now made the short trip down from local rivals Doncaster.
LLFC Manager, Glen Harris is excited to have captured Hamilton, whom he believes can become a hit with the fans.
He said: "It's brilliant to have Precious here. She's an interesting and exciting player to watch, and I think that the fans will enjoy seeing what she can do."
Sargeant has spent nearly 2 years at the Arsenal academy and playing for Arsenal reserves as well as being a regular in the England under 19 set up.
"Meaghan is a tall, strong, quick defender who can play anywhere across the back line and is one of the brightest young prospects in the country," added Harris.
"I have seen her develop as a footballer through the centre of excellence programme at Sheffield United and I am delighted that we have signed her for the forthcoming super league season."
"Having recentIy watched her in Holland playing for the u19s against France and Holland and she was the stand out player.
"I know with her working alongside experienced quality England players her game will develop and I fully expect her to be challenging for a starting place."