Celtic boss Brendan Rodgers has complained about a penalty given to Rangers during Sunday's entertaining 3-3 draw at Ibrox.
With the Hoops winning 2-0 following goals from Daizen Maeda and Matt O'Riley, Rangers were able to pull one back from 12 yards through James Tavernier.
Tavernier netted from the penalty spot after Fabio Silva was fouled in the build-up.
The spot-kick was given following a VAR check, with Silva initially booked for simulation.
Celtic boss Brendan Rodgers has admitted he's 'disappointed' following his side's stunning 3-3 draw with Rangers on Sunday
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And Rodgers, speaking to BBC Scotland, has now vented his fury - insisting he finds it 'disappointing' the penalty was awarded to his side's fiercest rivals.
"You expect some sort of reaction in the second half," he said.
"I'm disappointed with the penalty. If you watch it back, I think the referee makes the right decision in the game.
"Ali[stair Johnston] makes a really good challenge. The player then simulates and goes over. He went over a few times in the game.
"It went against us and you expect a bit of pressure.
"We had to stand up and fight, We get the third goal, excellent from Adam [Idah]. They then get a really good third goal.
"We're disappointed not to win, but to leave here with everything in our hands is what we wanted.
"We played with a calmness, really attacking with and without the ball.
"We made the crowd really edgy and that's what we want. We showed quality and heart in really tough conditions.
"To come here with no supporters, to show that mentality - you were never going to win anything today, but take it [the title race] in the right direction.
"There's still a lot to play for. There's a long way to go.
"We're in a really good position."
Rangers rival Philippe Clement, meanwhile, has hailed his side for their fighting spirit.
They looked dead and buried at 2-0 down and looked to be heading for defeat when Celtic went 3-2 up following a goal from Adam Idah.
However, Rangers snatched a point in injury time with Rabbi Matondo sending a spectacular effort flying into the top corner.
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Celtic boss Brendan Rodgers has taken aim at Rangers star Fabio Silva following Sunday's brilliant Old Firm derby
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And Clement said: "I don't know if it was classic but my boys did something special.
"We show our real quality and personality. We get a well-deserved point.
"We are more the winners of the day. It could have been more, but I think the result is also good.
"They took the message [at half-time] in the best way they can and showed who they really are in the second half.
"We showed a lot of power, resilience, personality and mentality. There's a lot of positives.
Celtic boss Brendan Rodgers feels there are positives to take from his side's 3-3 draw with Rangers
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"We showed we deserve where we are in the league, we need to be at the top.
"It was important to have Abdallah Sima back. I'm happy with what he could give today.
"Rabbi [Matondo], we've been working a lot on these actions and having more control in his finishes. I'm really proud of him, and the whole team.
"We're in the place we want to be. We managed to change the scenario in a really good way.
"It's the form of potential champions, but we have a tough challenger. It's good for Scottish football to have two teams with this quality."
