Leao and Chile's Ivan Roman were both sent off before the break, but second-half strikes from Goncalo Guedes and Fernandes sealed the win for Roberto Martinez's side.

Portugal came close to opening the scoring twice early on, with Ruben Dias's header saved by Lawrence Vigouroux, before Leao saw his shot bounce back off the post.

Cristiano Ronaldo then thought he had given Portugal the lead nine minutes before the break, but after finishing coolly under Vigouroux, his strike was ruled out for offside.

However, both sides were reduced to 10 men on the stroke of half-time.

After an initial altercation between Felipe Faundez and Joao Cancelo, players from both sides were involved in a needless scuffle, with Leao and Roman both raising their hands to each other, resulting in their dismissals.

Ronaldo was substituted at the break, and it was his replacement that gave Portugal the lead in the 58th minute. Fernandes's sensational, defence-splitting pass picked out Guedes, who poked the ball into the bottom-right corner.

The Manchester United skipper capped a fine individual display with a goal 15 minutes from time, sweeping a curling finish beyond Vigouroux from the edge of the area.

Chile threatened a comeback in second-half stoppage-time when Lucas Cepeda's excellent left-footed shot flashed past Rui Silva, but Portugal was able to hold on for the win.

Portugal boss Roberto Martinez put a positive spin on Leao's sending off, saying the experience of playing with 10 men could help when facing South American countries, such as Colombia.

"I liked many things," he said.

"First, as we discussed earlier, in the [FIFA] World Cup we have to be prepared for surprises. The red card forced us to play with 10 men against 10, with more space and more duels.

"It's very good that it happened now, because South American teams are used to that kind of thing. We're going to face Colombia, and it could happen.

"There were some very good aspects and others that weren't so good.

"Overall, what we showed as a team, we're starting to gel, and we won a match despite the surprise of playing with ten men in the second half."