For 138 years, Rangers and Celtic have contested Old Firm games central to determining which half of Glasgow lifts the league title.

For the last four decades, that dominance has been uninterrupted.

However, with the emergence of a third force in Hearts, and potentially a fourth in Motherwell, the stakes are now higher than ever.

Sunday's Old Firm game - live on Sky Sports from 11am - could be just as much about eliminating a rival from the title race than staying in it.

Sky Sports duo Kris Boyd and Chris Sutton have weighed in on this colossal encounter...

Sutton: Rangers favourites on Sunday

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Sky Sports' Chris Sutton believes Rangers are the favourites over his former club Celtic heading into Sunday's Old Firm clash at Ibrox - live on Sky Sports

"It is absolutely fascinating, nobody really saw Rangers slipping up on Sunday," Sutton said.

"They did well to retrieve it really at two down but if Sunday is a draw, then it's going to suit Hearts.

"At this moment in time with Celtic,...