Lam is fuming that Radradra appeared to suffer a leg injury early in Fiji’s Eight Nations Cup victory over Georgia in Edinburgh last weekend, but was not replaced by coach Cotter.
Now Lam says he will make a formal complaint to World Rugby over Fiji’s injury management of Bristol’s star player.
The Fiji centre is now set to miss Bristol’s opening two Champions Cup games against Clermont Auvergne and Connacht.
