The 23-year-old Frenchman has signed a short-term deal until the end of the season.
Manset, convicted of drink-driving in January when he was banned for a year and fined £1,400, could be included in the Cumbrians' squad for Tuesday night's game at Doncaster, but is unlikely to start.
"He knows he's made a few errors of judgement along the way, but we've sat him down and we've talked to him and we think he's ready to put that right," Carlisle manager Greg Abbott told the club's official website.
"It could be that we have another one who is hungry to prove people wrong and, if that's the case, he'll either earn himself a longer stay here or he'll be off to a higher division."
Abbott added: "He has a lot of ability and power and it will be interesting to see how he handles this next few weeks. He's not quite match fit yet so we'll have to be a little bit patient with him."
Manset was signed by Reading from Hereford in January 2011 and made 17 appearances for the Royals as they won promotion from the npower Championship last season.
He signed for Swiss side Sion in the summer following his release from Reading and has recently had trials with Barnsley, Sheffield Wednesday and Blackpool.
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