Portugal managed to seal a play-off spot earlier this week.
Nani also admits he would love to see national team boss Carlos Queiroz return to Old Trafford one day.
“Portugal have to be confident now because we have done well with a lot of new players and they are getting better all the time,” he said.
“It must be very different for Carlos Queiroz because here in Manchester he was the second coach.
“Being No.1 is a completely different position, but he is still the same person with me.
“Maybe he can come back here to United one day. I hope so, but you just never know.”
