Gordon Strachan says he would have dropped any Scotland player who brought Celtic and Rangers' fierce rivalry into the dressing room when he was in the Hampden Park hotseat.
The ex-Celtic boss spoke to DailyStarSport ahead of Euro 2020, where Scotland have taken one point from two games but face Croatia in their final Group D clash on Tuesday.
He said the Old Firm derby, among the most hostile in world football, could certainly be a problem for Scotland dressing rooms in years gone by.
But the ex-Southampton manager said he had a hardline approach to any disruption it caused, which included leaving stars out.
Asked if it was difficult for players to move past the rivalry, Strachan told us at a Betfair event: "Absolutely, yeah.
"What I've seen of the international team when I was there, there didn't seem to be a problem.
"Celtic were dominant at the time, that was a problem for the Rangers players, but I never really had a problem with it.
"It might have been a couple of years back but I made sure that never happened. If I spotted anybody with any tendencies they wouldn't be in the squad.
"I spotted tendencies in guys that actually thought they were playing, some of them were delusional, and thought they should be playing, and affecting players but I just wouldn't pick them again.
"If I had seen anyone bringing that in, they would not get picked."
The derby is known around the world for being one of the biggest in the world, with a history of furious on-field battles and off-field violence.
The atmospheres at Celtic Park and Ibrox are also known as being two of the loudest on the planet.
Celtic's fans have traditionally been identified as Catholic with a proud Irish patriotism, while Rangers are known as being Protestant with a Great British one.
Sectarian chanting has been a disruptive force before and after The Troubles in Northern Ireland.
Scotland go into the Czech game following a hard-fought 0-0 draw with England at Wembley on Friday.
But they have been dealt a major blow after it emerged that Billy Gilmour, who put in a man-of-the-match performance against the Three Lions, has tested positive for Covid.
He will miss the fixture along with a potential last-16 clash should Steve Clarke's side progress.
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