This means that the two teams will play on Sunday 27th April, clearly giving Rangers a massive advantage.
Celtic are to appeal over the decision and hopefully get it changed to another date, but it looks as though the SPL will do anything in their power to make sure Celtic don't win the league. The game will effectivley decide who wins the title.
The news is a massive blow to Celtic fans, who are planning to stay in Portugal for a few days after the game.
Still, if Celtic can do the business by a few goals tonight, some players could be rested for the away game.