Marcelo limped off the field in the 10th minute of Wednesday's game against Serbia.
The Costa Rican players have been heavily criticized back home and will hope to turn the pages to give their people something to cheer about.
For Mexico, the prospect of facing mighty Brazil with everything on the line is "the flawless scenario", the 31-year-old Guardado said.
A mysterious injury that forced one of Brazil's key players off the pitch against Serbia has been revealed.
On the other side of the coin, Brazil will see this as a game that they should win.
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Dr Lasmar admitted it was too early for an accurate diagnosis but believes the hotel's mattress could have something to do with it.
The 54-year-old went onto say that should Neymar be left out of the starting eleven then it would give the former Barcelona star more time to reflect on his performance, and that upon introduction he might be more effective for Brazil. "It's all under control".
Joachim Low's men were dramatically close to elimination from Russian Federation 2018 before Toni Kroos' late strike against the Swedes nestled in the top corner of Robin Olsen's net in Sochi lat Saturday, sparing them - for now at least - the humiliation of an anemic defense of the trophy they won in Brazil four years ago.
Marcelo in action for Brazil.
"Thank God it wasn't anything serious", Marcelo said on Instagram. Doctors had said Costa's problem was likely to take more time to heal.