Christian Eriksen could have got on the scoresheet himself, after his volley was handled by Renato Veiga inside the area. The United midfielder stepped up to take the penalty but Diogo Costa dived to make a superb save, after the keeper appeared to be given words of advice by Ronaldo.
Eriksen then had a shot cleared off the line by Diogo Dalot, who started the game for the visitors, along with Bruno Fernandes.
Our skipper was disappointed with his nation's performance and the outcome.
"We knew they were aggressive and that they would come out strong," said Fernandes.
"We lacked aggression and needed to be stronger in the duels.
"We have a difficult game ahead of us but we really want to win, and, at home with our fans, we are sure that we'll be able to turn the game around."