"Faced with personal problems, Zac could not stand the distance between here and New Zealand and he expressed his wish to join relatives."
"Despite the help of the entire team and the fact that we have accompanied him throughout the year, it was not enough."
Guildford's tweeted he's been unable to return to his best at Clermont and feels it is time to move on and be closer to family.
"Unfortunately couldn't return to my best rugby at Clermont and thought it was time to move on and be closer to family thank you for asm fans." Guildford Tweeted.
"Another opportunity for me to become fitter and mentally stronger. No point in thinking of what could of been time to look to the future."
The former Crusader was handed a lifeline by Clermont when the 11-test All Black lost his New Zealand contract after repeated behaviour problems and battles with alcohol.