Folau brothers

Israel Folau's brother John Folau set for Super Rugby debut with NSW Waratahs

Now it's potentially double trouble for the bottom-placed and soon-to-be-extinct Sunwolves, with Folau's younger brother John in line to make his NSW Waratahs debut at Newcastle's McDonald Jones Stadium.

John Folau, in his maiden season at the Waratahs after switching codes from rugby league, was promoted to the bench on Thursday after winger Curtis Rona was ruled out with a groin injury.

While Alex Newsome will start as Rona's replacement, the 24-year-old Folau is almost certain to be unleashed on the Sunwolves at some point in the second half.