Thomas Rogne believes Celtic were 'cheated' out of an obvious penalty in Wednesday's 1-1 draw with Hamilton.
Anthony Stokes' late penalty rescued a point at New Douglas Park, although Rogne felt they were denied a clear spot-kick earlier in the game.
Niall McGinn went down in the area under pressure from Martin Canning and not only were the visitors not given the decision, but the Northern Irishman was booked for diving.
Neil Lennon was far from impressed with referee Willie Collum's officiating of the game in which three players were sent off, and Rogne has taken it one step further by claiming they were cheated.
"We were cheated out of an obvious penalty when the ref gave a yellow card for diving," the Norwegian is quoted as saying in his homeland.
The draw moved Celtic five points clear of second-placed Rangers, although their arch-rivals now have three games in hand.
Celtic's inability to claim the three points has piled the pressure on Lennon's troops, but Rogne insists the players will bounce back from the disappointment.
"We don't think about anyone but ourselves," he continued. "We want the three points in every game. The only pressure we've got is what we put on ourselves.
"I think there should be pressure on a player to get three points in every game they play for Celtic. That should be a motivation, not something to get nervous about.
"Of course this result is disappointing but it's not a sprint, it's a marathon. Even if we drop a few points, we should come back from it. That's what we look forward to doing and to keep winning.
"It was a major incentive for us to go seven points clear and we didn't take it so that's disappointing. But we don't care about Rangers too much, it's all about us. We know that we can do better than this and that's what we are going to do."