Rangers boss Michael Beale has vented his fury after Kemar Roofe had a goal disallowed against Celtic on Sunday.
Kyogo Furuhashi netted the only goal of the game to give Brendan Rodgers' side all three points.
The 28-year-old broke the deadlock just before the interval, finishing expertly past Jack Butland in the Rangers goal.
Before that, however, Roofe had seen his goal disallowed after Gustaf Lagerbielke was fouled in the build-up - with VAR intervening.
Kemar Roofe had a goal disallowed as Rangers lost to Celtic
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And Beale, speaking to BBC Scotland, has now admitted he feels VAR got the decision wrong.
"It's been a rough week," he said. "Today, I thought the performance merited more in the game.
"I thought we started the game quite well - obviously we score an offside goal, and then the VAR call.
"Having seen it back, he kicks Cyriel [Dessers], so I think it's a harsh call.
"I think that's one that's gone against us, but there's a lot of time to play in the game.
"The goal is an error on our part, a huge error, and second half, we pushed and pushed, but you'd like us to be more inventive and ruthless, because the chances were there.
"It's a desperately disappointing day for everybody.
"We're behind them, and we have a lot of catching up to do. I thought we were strong in the game.
"There are areas we can improve on, but we had the moments - we were in front of Joe Hart two or three times and our last pass or shot wasn't good enough.
"That's where the frustration is. We have to come back stronger after the international break."
Former Rangers striker Chris Boyd agreed with Beale and labelled the decision to disallow Roofe's goal 'shocking'.
“It’s an absolutely shocking decision," said Boyd.
“VAR has decided to call it back but you can see Lagerbielke kicks the back of Dessers’ foot.
“If we are getting goals chalked off for that…
“All we hear is we want to see more goals, we want to see more entertainment - that there was a goal.
“He’s caught on the ball, he goes to play with his left foot when he should clear it with his right.
“He swings at it and Dessers takes it off him then Kemar Roofe finishes it magnificently.
“How that can be brought back for a foul is incredible.
“Once Don Robertson goes over there he has to be stronger.
"He made the decision on the field so he’s got to be stronger.”
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Kyogo Furuhashi scored the winner for Celtic against Rangers in the Old Firm derby
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The result has seen Celtic rise to top of the league, with the defending champions amassing 10 points from their first four fixtures.
As for Rangers, they're fourth in the Scottish Premiership standings having won just two of their opening four matches.
