The Brazilian and his colleagues trained at City's Etihad Stadium on Monday ahead of the massive Champions League semi-final first leg.
And the world's media were there to film the 13-time European champions going through their final preparations.
But they also witnessed veteran left-back react as though he had committed an almighty mistake when he walked over the City badge.
As you walk out the Etihad tunnel, there is a mosaic of City's crest and Marcelo, having been in mid-conversation, didn't realise it was there.
But then when made aware by a couple of his teammates afterwards, Marcelo brought his hands to his head and looked distraught.
In recent times, plenty of players have refused to walk on crests out of respect.
In the previous round, Atleti players Rodrigo de Paul, Luis Suarez and Angel Correa opted to walk around - though Antoine Griezmann wasn't quite feeling as respectful and strolled as normal.
Rodrigo de Paul, Luis Suárez and Ángel Correa all avoided stepping on Manchester City’s crest before entering the stadium for training.— Atletico Universe (@atletiuniverse) April 4, 2022
Respect 👏 pic.twitter.com/sQTlx5kUEz
Erling Haaland, heavily linked with making a mega move to Manchester City in the summer, memorably refused to step on the City badge when he played at the Etihad with Borussia Dortmund last year.
Vinicius Jr, meanwhile, actually went as far as jumping over the Real badge during a game.
That’s mentality right there! Playing for the badge. What you believe in. Vinicius is a rising star 🌟 pic.twitter.com/H1gWqHzdLh— I.M.HDK (@Hammad_1168) January 9, 2022
In the same game where he struck a brace against Valencia, the Brazilian hopped over the crest on the side of the pitch as he chased the ball out of play.
Similarly, compatriot Dani Alves avoided standing on Barcelona's badge and his actions encouraged youngster Nico Gonzalez to follow suit.
Featured Image Credit: Image: MARCA
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