Marcelo appears set to start for Brazil against Mexico after taking part in training in Samara on Sunday.
The left-back lasted just 10 minutes of Brazil's 2-0 Group E win over Serbia on Wednesday, when he was forced off with back spasms and replaced by Filipe Luis.
For all latest news, follow The Daily Star's Google News channel. Team doctor Rodrigo Lasmar suggested a hotel mattress may have been the cause of the issue, but remained optimistic that Marcelo would recover in time to face Group F runners-up Mexico in the last 16 on Monday.
And those positive predictions were borne out as Marcelo joined the rest of his team-mates in practice on the pitch at Samara Arena.
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