Jim Goodwin has made clear his surprise VAR didn't intervene over a challenge on one of his players by Celtic defender Julian Araujo.
Before Martin O'Neill's side went on to win convincingly by four goals to nil, and with the score at 2-0, the Mexico international right-back went in on Will Ferry and caught the left wing-back late.
Referee Nick Walsh flashed a yellow card and that remained as his punishment with VAR Andrew Dallas and assistant Gavin Duncan not deeming it necessary to get involved and recommend any action.
Goodwin was surprised and that and the Dundee United boss said: "I thought the Celtic defender was a little out of control if I am honest. Will Ferry took a real sore one. VAR seemed to skim over it pretty quickly, I don't think there was a call for the referee or anything.
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"If they are satisfied with that, then it's fine. But for us. Will was certainly caught high on the ankle."
Giving his take on the game, the Irishman added: "We always knew today's fixture was going to be difficult. We know the quality Celtic have got but obviously the change in management has given the players and home supporters are real lift because the atmosphere here was a lot better than what it was a week prior.
"When you come here you know you're going to be starved of possession at times and you have to really show a bit of resilience in and around your penalty area.
"I think today there's lots of areas within the goals we've conceded we could've done a lot better. When you give Celtic a two-goal advantage it becomes a mountain to climb.
"When you come here you have to do the basics well defensively, at times you need your goalkeeper to make saves and when you get half chances you've got to be clinical and take them, we couldn't do that today."
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