Carlisle manager Greg Abbott has opted not to offer former Everton teenager Femi Orenuga a contract.
Orenuga, 19, has been training with the Cumbrians since early September following his release from Everton.
"Femi is a really nice lad and has worked really well with us over the last few weeks," Abbott told the club's official website.
"He's a good player, but in our situation we're always looking for players who are better than what we have and who will give us more options.
"We couldn't guarantee him anything at this moment in time so he moves on with our best wishes."