Glasgow Rangers suffered a shocking defeat to Old Firm rivals Celtic at Parkhead this afternoon, losing 4-0 in an incredibly one-sided encounter that will give Ange Postecoglou and his men further momentum.

The Ibrox side came into the tie trailing the Premiership leaders by two points and were looking to overhaul that deficit and leapfrog them at the top of the table with a victory this afternoon.

However, it turned out to be a terrible day at the office for Giovanni van Bronckhorst and his side, with plenty of mistakes made by the backline, including a howler by goalkeeper Jon McLaughlin to allow David Turnbull to score Celtic’s fourth of the match.

The Light Blues couldn’t cope with the sheer relentlessness of the Celtic attack and were second to almost every ball.

Yet again, lessons were not learned from the 3-0 defeat in Van Bronckhorst’s first Old Firm clash as manager, and the way these matches are approached will need to change going forward.

There were plenty of poor performances, with Glen Kamara being particularly anonymous but Antonio Colak’s stood out as arguably the worst of the outfield players.

Colak was an Old Firm disaster

The striker came into the clash having scored seven goals in his previous seven matches and was arguably Gers' biggest threat.

The match didn’t exactly go to plan however as he received a rating of just 6.1 from SofaScore, the lowest on the pitch from both sides.

He had a total of just ten touches during the match, making just one successful pass and he had three shots off target.

The Croatian also lost 80% of his total duels during the contest, failing to establish himself either in the air or on the ground.

It was a disastrous performance all round from the player, especially after a strong start to life at the club. The Old Firm derby puts pressure on both teams that many players haven’t experienced before so this could well be a reason for his display.

Rangers take on Ajax on Wednesday evening in the Champions League and Van Bronckhorst will be aiming for a massive reaction from this abject result.