This Sunday Ibrox plays host to the third Old Firm game of the season and with Rangers sitting seven points clear at the top with a game in hand, this really is a must-win game for Celtic.
If Rangers win, the "title race" would surely be over but Celtic have the chance to reduce the gap to four points, putting much more pressure on the Gers.
After doubts about whether he would be fit for Sunday, Allan McGregor is in the squad and is expected to start the game.
For Celtic, Robbie Keane hasn't trained all week but may play, and Glen Loovens faces a late fitness test. Without Loovens, they have a very inexperienced central defence and with Kenny Miller and Kris Boyd likely to start the leaky Celtic back-line could be up against it.
Although, they certainly don't lack attacking options with around seven to eight attacking players in the squad.
With the build-up to the game mainly focusing on Celtic's referee complaints there is a great deal of pressure on the man-in-the-middle Dougie McDonald and we will be hoping for some less controversial decisions this weekend than the last time these two great rivals met.