Tranmere Rovers can confirm the signings of Conor Robson, Joe Starbuck and Jean Belehouan on short-term contracts.
The trio have signed short-term deals after impressing with their attitude and performances in training at The Campus.
19-year-old goalkeeper Robson has previously represented Stoke City at various youth levels, and appeared for Rovers in pre-season.
21-year-old Starbuck can play both at right back and in midfield, and progressed through the academy at Grimsby Town before spending two years with Sheffield United.
Left-sided defender Belehouan is adept at both centre-back and left back, and also played in the youth setup at Sheffield United.
The 23-year-old was part of the academy at Manchester United as a youngster, and has made 23 senior appearances to date.
Interim manager Nigel Adkins said: “Having had a period of training with us, the players have been given short-term contracts to try and impress further and fight for a place for a team.”