The New Zealand Rugby Union (NZRU) terminated troubled winger Zac Guildford's contract early on Thursday.

The decision means Guildford, whose struggles with alcohol have been well-documented, will be free to pursue a fresh start with French club side Clermont earlier than anticipated.

The 25-year-old was due to see out an NZRU contract with the Canterbury Crusaders until the end of the Super 15, then make the switch to Top 14 rugby with Clermont.