The RFL have handed out three official cautions for incidents round 20 of the Super League.
Nick Scruton, Michael Vella and Jean Philippe Baile have all been warned over their future conduct after separate incidents.
Bradford prop Scruton has been warned for his high challenge on Hull KR captain Vella. Scruton was penalised for the offence during the game, with Michael Dobson slotting over the resulting penalty.
Vella has also received a caution from the RFL for an illegal tackle in the same match.
Catalans centre Baile received his warning for a bad tackle in their 24-22 defeat against Wigan.
The cautions will remain on each player's record and will be taken into account in any future disciplinary breaches.
The RFL have also sent a warning letter to Celtic Crusaders forward Jordan James for a suspect tackle on Salford centre Stuart Littler during his side's 25-12 win over the Willows Road outfit.
Vella has also received a caution from The RFL for an illegal tackle in the same match.