Ruben Dias looks rusty! Five things we learned as Atletico Madrid prove Man City aren't invincible

The towering Portuguese is normally the one defender City can rely on but he was not on it today. Dias gave the ball away on several occasions and in dangerous areas too. He was fortunate that Pablo Barrios did not give Atleti the lead when he presented him with the ball and it fell on Stefan Ortega to get him out of jail.

He also gifted a chance to Memphis which the Dutchman failed to take advantage of, sending the ball over the bar. Dias did not heed the warnings, however, and he was careless in possession once more and just moments later Carrasco scored.

He sought to make amends with a crashing header which gave City faint hope but that should not mask the fact he was way off the pace. The Portuguese was one of Guardiola's most consistent performers in the final stretch of last season but will need to be sharper when the Premier League season begins.

It is a far from easy to come in and replace a modern club legend like Ilkay Gundogan but that is ultimately what Mateo Kovacic has been tasked with doing. The Croatian still looks like a good fit for City but one area he desperately needs to improve in is his finishing.

He was presented with a glorious chance to give City the lead early in the first half, arriving in the area to meet the ball first time. It was the type of chance Gundogan would have had for breakfast, but Kovacic spooned the ball over the bar.

Gundogan scored 60 goals for City and always seemed to find the net on the biggest occasions. Kovacic, meanwhile, struck just six times in 221 games for Chelsea. He has a lot of work to do.

Diego Simeone is the type of man who almost certainly cheats in board games with the family at Christmas. And he does not understand the concept of a friendly match.

Atletico treated this game as if it were a Champions League knockout game. Indeed, you could argue they showed more ambition in Seoul than for most of their quarter-final tie with City two seasons ago, which ended in a mass brawl.

There were no punches thrown here but tempers flared on a number of occasions and Rodrigo De Paul was in a particularly combative mood. While City seemed to fade in the second half, Atletico turned the screw. They thoroughly deserved the win and, on this evidence, City will be hoping to avoid them in the Champions League group stage draw.

Atletico's two goalscorers have had strange careers. Memphis was good enough to be signed by Manchester United at the age of 21 but his time at Old Trafford was a disaster and it was only years later that he managed to get his career back on track.

Carrasco, meanwhile, scored in the 2016 Champions League final and was a crucial player for Atletico but then two years later decided to move to the Chinese Super League. He saw sense in the end and has been back to his best since returning to Atletico in 2020.

And against the European champions and treble winners, they proved their enduring class. Memphis looked threatening throughout the match and struck the ball perfectly to break the deadlock from outside the area. Carrasco then pulled off a zig-zagging run down the left wing before producing a thumping low finish.

City's high defensive line was badly caught out on two occasions in the match against Yokohama F Marinos and Atletico also exploited it here.

Even though the breakthrough goal came from a long range strike, Simeone's side repeatedly got behind City's defence and could have scored at least twice before half-time.

Thomas Lemar and Samuel Lino both managed to cause havoc down the left flank on the counterattack and City were fortunate that Alvaro Morata missed the target with a free header and that Lemar failed to control the ball in the area.

Will Guardiola persist with the high defensive line when the Premier League season starts? First Yokohama and now Atletico have made a compelling case for him to abandon it.