Cristiano Ronaldo says Portugal still have plenty of room for improvement, despite their 1-0 success over Morocco on Wednesday.

The Real Madrid legend’s fourth-minute bullet header, his fourth goal of the tournament, was enough for his nation to climb to the top of Group B in the World Cup.

“I’m very happy. The most important thing was to win the game and to get the three points,” Ronaldo said after a hard-fought victory.

“We knew if we lost we could be out. We knew Morocco would be giving their all. It was a surprise at the start because they were so strong.

“I managed to score a goal, it was great for me.”

Portugal’s final group stage encounter is against Iran on June 25 in Saransk, and Ronaldo hopes his team can top their group.

“Our expectation is to continue our work and try to improve in the group phase,” Ronaldo said.

“We’re almost there (knockout stages) and then we’ll see. We’ll take things match after match. We will try to come first in the group.”