International rugby rules ban him from being on the field, but ACT Brumbies mentor Stephen Larkham will use a loophole to become the first Super Rugby head coach to double as a waterboy.

Super Rugby's governing body SANZAR has cleared Larkham to become the most high-profile waterboy since Adam Sandler played Bobby Boucher in the 1998 Hollywood hit.

Stephen Larkham - the most famous waterboy since Bobby Boucher.

International Rugby Board protocols dictate head coaches are not allowed to run the water.

But because Laurie Fisher is the Brumbies' director of rugby, SANZAR has cleared Larkham to be on the field while Fisher is in the coach's box.