Raiders forward Sia Soliola has been referred straight to the NRL judiciary for a high tackle on Billy Slater and is one of four players charged from Saturday's Round 20 matches.

Soliola's Canberra teammate Jordan Rapana is facing a one-match ban for a shoulder charge on Melbourne forward Nelson Asofa-Solomona and risks a two-match ban if he unsuccessfully fights the charge at the judiciary.

Meanwhile Titans forward Leivaha Pulu is facing a $1100 fine for tripping Panthers winger Josh Mansour, while Warriors centre Solomone Kata can avoid a suspension if he pleads guilty to a dangerous contact charge.