Olivier Ntcham scored the only goal of a hard-fought game to claim all three points for The Hoops.
The Ibrox club have five points after four league games - the fewest they have accrued at this stage since the 1989/90 season. I've been around the game a very long time, and that's a foul in my book.
"Some players will go away on worldwide duty, and we hope they come back healthy". I just went in and had a calm chat. For me it's a blatant foul, he's swept his legs.
"If we'd lost the game with a moment of class or brilliance from Celtic I'd have held my hands up, but the referee's cost us for sure".
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The group is led by the Tehreek-e-Labbaik Pakistan (TLP) party, which campaigns for those accused of blasphemy to be put to death. It emerged as the fifth largest party in the election in terms of the number of votes obtained across the country.
Celtic's James Forrest rocked the crossbar with a 30-metre effort in the first half while Mikael Lustig was also denied by the woodwork when he nodded against the post from a corner.
"We didn't give too much away, then had the courage and quality to play". "We kept the ball better and we made passes and created a few decent openings". They have been together for 150-odd games and they have experience - winning experience and we have been together for 12 or 13 weeks. But there's still work to do. It is a chance for us to get [Lassana] Coulibaly fit, [Eros] Grezda fit and [Graham] Dorrans fit - players that will help us become better and stronger. We need to focus not on officials, if we can help it, but on ourselves.
Celtic skipper Scott Brown picked up an early booking from referee Willie Collum for a foul on Kyle Lafferty and there was some controversy in the 25th minute when Rangers goalkeeper McGregor, after punching clear a Callum McGregor free-kick, appeared to kick out at Celtic defender Kristoffer Ajer who fell to the ground but play carried on.