The Cumbrians had agreed a deal with the 23-year-old on March 11, but had been unable to hand the striker his debut after his former club FC Sion refused to hand over his registration.
But the deal was confirmed by all parties on Friday afternoon and Manset could now make his debut against Yeovil.
Boss Greg Abbott told the club's official website: "We're pleased that we have finally got this one finalised.
"There has been a hold-up with the international clearance side of things but that's done and dusted now.
"We can put that behind us and Manny can get started on what it is he has come to us to do.
"He wants to show everyone that he is ready to get his career back on track and, if that turns out to be the case, this should prove to be an excellent move for all concerned."