Celtic have released a statement claiming that Rangers held an unfair advantage between 2000 and 2011.
The statement comes after Her Majesty's Revenue and Customs won an appeal against Rangers over a series of payments to players.
"We are aware of last week's Court of Session ruling, which we note is subject to potential appeal," the statement read.
"Celtic's position on this issue is consistent - that this remains a matter for the courts of law and also the Scottish football authorities whose rules are intended to uphold sporting integrity.
"In 2013, we expressed surprise - shared by many observers and supporters of the game - over the findings of the SPL Commission that no competitive or sporting advantage had resulted. That remains our view."
Rangers chairman Dave King has said that the club should not be stripped of the six Scottish Premiership titles won during this time.
