The two European heavyweights played out a Champions League epic with Real Madrid striking back on three occasions in a pulsating affair.
But throughout the game, Real Madrid looked suspect at the back. In particular, it was Militao who seemed nervous each time a City forward approached his area.
There was one particular moment that drew the ire of Los Blancos fans where Militao stepped out of defense allowing Riyad Mahrez to steal in and come close to scoring.
Dani Carvajal would spare the Brazilian the blushes following a rebound off the post from Mahrez's strike. It fell to Foden with Carvajal clearing off the line.
It's not just Madrid fans who have lamented the Brazilian's performance, as Militao has been deemed as Los Blancos' 'weak link'.
Here are some of the reactions to the 24-year-old's performance against Manchester City:
Real Madrid's defensive display against Manchester City proves they need Antonio Rudiger
According to Fabrizio Romano, Madrid have reached a verbal agreement with Chelsea centre-back Antonio Rudiger.
The German is set to join on a free transfer when his contract with the Blues expires in the summer. If there was ever evidence needed to show why the signing is required, the latest performance of the team was it.
Madrid were poor positionally in defense. Both Militao and David Alaba had very disappointing performances at the heart of the La Liga side's defense.
Not only was Militao a nervous wreck through much of the semi-final clash but Alaba's experience seemingly went out of the window.
For Manchester City's second goal, Kevin De Bruyne threaded a ball through, towards Gabriel Jesus. Alaba should have shrugged the Brazilian off the ball, but he was easily ridded of by the City striker who then dispatched past Thibaut Courtois.
Real Madrid will be encouraged by their comeback on multiple occasions but defensively they are vulnerable.
Rudiger has been instrumental in Chelsea's defensive rejuvenation under Thomas Tuchel since the former PSG manager took over in 2021. He won the Champions League last season with the Blues and was pivotal in the hugely impressive defensive set-up Tuchel formulated.
Los Blancos fans will be thankful that their attackers, particularly Karim Benzema, are at the peak of their powers. Without them, they would surely be down and out.
Next Wednesday's second-leg fixture between the two sides promises to be a fascinating affair with City in the driving seat.