Cochlin was a key player for the Crows last season and was voted supporters' player of the season last campaign.
The 21-year old is a British Colleges and British Universities representative and scored twice in the Welsh Premier League last season from 30 appearances.
Once Carmarthen's European commitments end Cochlin iso ff to Northampton Town for a trial while he will be expected to play for Team Bath while he studies at the local university.