Central defender joins from Leicester.
U's boss Joe Dunne has continued his positive work in the January transfer window by signing Leicester City defender Alie Sesay on loan for the rest of the season.
Having joined the club as a sixteen year old, the 19-year-old centre back has been a regular in the Foxes U21s side this season, captaining them for most fixtures.
Alie will wear shirt number 39 during his time with the club.
A quick, powerful centre half, Alie met with his new team mates for training on Friday and is expected to be in the U's squad for the game versus Shrewsbury Town on Tuesday.