Cameron Carter Vickers and the Celtic research that marked him out as perfect for Ange Postecoglou

Even during the warm-up at Hampden today, the noise from both sides will reverberate around the ground.

With a now-rare 50/50 split of Old Firm fans for the Scottish Cup semi-final, the atmosphere will be bubbling under long before kick-off.

But while the decibels rise outside, deep in the bowels of the stadium’s main stand Ange Postecoglou will sit alone.

Minutes before one of the biggest games of Celtic’s season, their manager will find a quiet spot to READ a book or the match programme.

For the Hoops boss, that period of calm and focus is the perfect preparation for the bedlam that is sure to follow.

Postecoglou has very little interaction with his players before matches.

His work has been done at Lennoxtown in the days and weeks previous.

But as he proved prior to the League Cup Final in December against Hibs, his carefully-chosen words before his team head out can be inspiring.

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Celtic released a recording of Postecoglou’s dressing-room pep talk that was concise but motivational.

He’s hoping to have the same effect on his players today before they face Rangers.

But not until after he has found a spot in Hampden somewhere to clear his head ahead of the mayhem unfolding.

Postecoglou said: “I’ll