"We're nearly there (knockout stages) and then we'll see. The first game was a good sign for us".
He added: "If we put three [players] on Ronaldo, I don't know how we would mark the others".
"The Danish, they are a strong team", van Marwijk told reporters.
The Real Madrid star followed up his hattrick against Spain on Friday with a fourth-minute header that was his 85th goal for his country in 152 games.
There are no new injuries in both camps and while we anticipate slight changes in the Moroccan starting team, we do not expect the Portugal coach to ring changes.
Ronaldo's goal against the North Africans means he has now scored 85 global goals, more than any other European player in the history of football.
It was far from a convincing Portuguese display and Santos admitted nerves played a factor, insisting they can not overlook Iran in their final group game on June 25.
Ronaldo's four goals tops the individual scoring chart at the World Cup.
"We did well defensively, but we need more than that". Things do not work like this.
Joao Moutinho then nipped in ahead of Mbark Boussoufa to get a vital clearing touch in the six-yard box as Morocco consistently targeted the right side of the Portuguese defence.
"I'm not disappointed about the performance", Renard said. "We took a lot but we weren't rewarded".
What is impressive to Soares about Ronaldo is his efficiency, as the 33-year-old has been able to make the most of his chances thus far in Russian Federation to deliver a huge impact on the tournament.
Speaking during his post-match press conference, Renard said: "We qualified for a World Cup after 20 years and we've showed that we can play football".