Canberra winger Sandor Earl is the subject of claims he used peptides to aid his recovery from shoulder problems while he was at Penrith in 2011.

Channel Nine made the allegations on Thursday night, naming Earl, who recently signed to play rugby union in France with Pau, as using peptides at a private clinic in Cabramatta without the knowledge of Penrith officials at the time.

A source close to Earl confirmed on Thursday night that, having become frustrated with the medical systems in place at Penrith, he was recommended to a specialist in musculoskeletal rehabilitation in an effort to get him back on the field.

An NRL spokesman would not be drawn on the allegations, maintaining the administration would let the ongoing investigation by ASADA run its course.