Traffic seems to be the problem
It is one of the most anticipated games in years, in both Scotland and Ireland, but it seems hundreds of fans if not more, are still outside the ground.
Before kick off there were reports of fans being stuck in traffic and there were even calls that the game be delayed. As you know it wasn't but it explains the empty seats you can see on TV.
This tweet, by BBC journo Jonathan Sutherland shows just how many fans are still making their way in to Celtic Park.
