"We have been here for a few years now and have lost more games than we have won against them, we need to improve and work harder".
Amid the chanting and singing, some of it questionable in its sentiments, the game was delayed after Rogic had opened the scoring when a flare was thrown into the Rangers penalty area from behind the goal where Hoops fans Saturday Ibrox stewards then had to work hard to contain some Gers fans after Celtic players celebrated Griffiths' goal in front of them. The disaster first goal, there were two or three good chances to clear, then they win the second ball and score.
At this point the movement of Celtic's attacking players was causing Rangers all sorts of problems, pulling their defenders all over the place.
The Scotland internationalist's second half strike secured a 2-0 victory for the Hoops that opened up an eight-point advantage ahead of their cross-city rivals.
Griffiths spurned a glorious headed opportunity, while Patrick Roberts tormented the Rangers defence repeatedly from the right flank.More news: Iran unveils new long-range ballistic missile
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Rangers: Foderingham 7, Tavernier 5, McCrorie 6, Cardoso 6, Hodson 5, Candeias 6, Dorrans 5, Jack 5, Pena 4, Windass 6, Morelos 6.
Though this weekend's match is across Glasgow in Ibrox, Rodgers noted that the atmosphere he has witnessed at Celtic Park for Old Firm matches is different to anywhere else. Not even a minute is on the clock and Celtic are nearly on the scoresheet.
Tempers flared at half-time as Rangers manager Caixinha and Celtic captain Scott Brown exchanged words in a heated confrontation as the players made their way up the tunnel. It is a clumsy tackle and Celtic have got away with one.
They faced a Rangers side that was unbeaten in five matches in all competitions and would do everything to inflict defeat on their bitter rivals.
The free scoring and utterly dominant Celtic will be expected by most to dispose of Rangers on Saturday. The loose ball falls kindly for Roberts who shoots from the edge of the penalty area.