It was Silva's header from a Neymar corner that ensured Brazil will take on Group F runners up Mexico in the round of 16 ahead of a possible clash with Belgium in the last-eight.
The left back player limped off the field in the 10 minute of Wednesday's game against Serbia and was replaced by Filipe Luis.
Dr Lasmar admitted it was too early for an accurate diagnosis but believes the hotel's mattress could have something to do with it.
Once word got out of the freaky injury, social media reacted.
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Marcelo missed three Real Madrid matches due to a hamstring injury in February but has otherwise been largely injury free in recent years.
"Marcelo is medicated and with medication the tendency is that the response is good and that he can play". "It was a spasm in the stabilising muscle and you can't play with that".
Doctors will blame a soft mattress for an injury before admitting they made mistakes getting the players ready for the tournament in Russian Federation.
"There is no recovery period".
After a dramatic game between Germany and South Korea, we come your way with another game that could also see another big team out of the tournament.