Leinster man Bernard Jackman will leave French club Grenoble with immediate effect.
It seems there was a difference of opinion between Jackman and the Grenoble board about plans for next season.
Mike Prendergast and Aaron Dundon will take temporary charge.
Last September, the Grenoble players took a three per cent pay cut and there are concerns about the financial stability of the club.
The French outfit currently lie second from bottom of the French Top 14 with just six games remaining.