England hooker Roby attempted to play on following a tackle from Jermaine McGillvary after 27 minutes .
England hooker Roby soon had to be replaced and Saints coach Royce Simmons admitted he fears the worst .
England hooker Roby attempted to play on following a tackle from Jermaine McGillvary after 27 minutes but soon had to be replaced and Saints coach Royce Simmons admitted he fears the worst .