"Those relaxed moments are going to be good for the overall experience," said Fernandes.
Portugal manager Roberto Martínez emphasized the physical readiness and internal drive of his captain, whose current contract with the national team runs until July.
"It's his sixth World Cup but I can tell you that, internally, it feels like his first when it comes to intensity, emotions and how important it is to be ready," said Martínez.
"He's essential to the team, he's the striker, the killer, he can open up space for other players and he's got excellent numbers."
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Ticket prices for the international fixture at the Houston venue reached a minimum resale value of $1,247 (£929) on Tuesday evening, contrasting with a nearby Houston Astros baseball game starting at $6.15 (£4.58).
