Celtic have accused the SFA of unfair treatment over Glenn Loovens' one-match ban, reports the Scottish Sun. Hoops chiefs are furious Rangers star Kyle Lafferty escaped punishment over an incident identical to the one Loovens was collared for.
Loovens' challenge on Gers' Maurice Edu last season saw him hauled before the video review panel and banned. But Celts are raging that Lafferty has not faced a trial by TV.
The Hoops have written to the SFA demanding to know how they decide which players are hauled up.
It's believed they also highlighted incidents in recent games, including Gers skipper Davie Weir escaping serious punishment for a late tackle on Scott McDonald.
A Celtic spokesperson said: "We have written to the SFA on two occasions to ascertain the criteria for referring incidents to the SFA Review Panel.
"The process seems to be disparate and arbitrary. Our objective is to ensure these processes are applied fairly, consistently and in a transparent manner, for the benefit of all clubs and players." An SFA spokesman said: "We couldn't respond while the Glenn Loovens case was ongoing, but will now do so in due course."