Mexico started the better side but were undone when Cristiano Ronaldo set up Ricardo Quaresma to break the deadlock, and it looked as though Javier Hernandez's header would not be enough for a point as Cedric Soares' deflected strike restored Portugal's advantage.
Portugal take on tournament hosts Russian Federation in their next group-stage outing on Wednesday afternoon, before then facing outsiders New Zealand three days later.
"I think that, when football people enjoy the way we play, especially against a team like the one we faced, it's very positive", he said.
London Police Treat Mosque Attack as Terrorist Incident
The incident comes at a time when emotions are high in the United Kingdom , in the wake of a series of deadly terrorist attacks. London police say one suspect has been detained in an apparent early-morning attack on worshippers standing outside a mosque.
Portugal coach Fernando Santos said it was not the performance he expected from his team.
Mexico captain Andres Guardado towed the same line and was adamant that technology will be good for the game over the long run.
"If we apply it to perfection we have a very good chance of beating Portugal". We played without confidence, couldn't connect two or three passes. A report by a Portuguese newspaper two days before Sunday's game said that the Madrid forward had made the "irreversible" decision to leave the Spanish club because he was upset with the allegations. The team said that he couldn't go because he was receiving post-game treatment, although it said it wasn't anything serious.
London Police Plead for Calm after Attack at Mosque
A man was inside in the van, I saw with my eye, and the old man was also on the ground, and I see some people were also injured. But in the past decade, the mosque has transformed its image, with its leadership outspoken in advocating interfaith harmony.
Borussia Dortmund midfielder Raphael Guerreiro failed to deal with a cross into the box and Carlos Vela teed up Hernandez, who met the cross with a diving header. The image used was one of Ronaldo winking to his teammates when former Manchester United teammate Wayne Rooney was sent off in a game between Portugal and England at the 2006 World Cup.
The referee held up the game for the assistant to check the replay, before the goal was cancelled 40 seconds later, as Pepe had been adjudged to be offside.
Britain's May Confident on Deal to Stay in Power
THE TORIES HAVE been told that forming a government with the DUP could jeopardise the peace process in Northern Ireland . On Brexit, Ms Foster said her party wanted to see "a sensible Brexit and one that works for everybody".
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