JD Sports and Elite Sports have confessed to "cartel activity" in illegally fixing the retail prices of Rangers-branded replica kits and other clothing.
The Competition and Markets Authority (CMA) said the price fixing took place from September 2018 until at least July 2019.
The football club also took part in the alleged collusion, but "only to the extent" of fixing the retail price of adult home short-sleeved replica shirts from September 2018 to at least mid-November 2018.