The 31-year-old was a doubt to feature in the meeting with Portugal on Wednesday as a result of a head injury picked up in the game prior but played the full 90 minutes wearing a scrum cap as protection.
Buoyed by his hat-trick against Spain on Friday (Saturday NZT), including a spectacular free kick late in the game, Ronaldo scored against Morocco with his first meaningful touch early in the match.
Portugal is in Group D of this year's tournament alongside Spain, Morocco and Iran.
"Like all the players at the World Cup, he wants to play every game", Renard said.
Morocco, who had a real go at the Luzhniki Stadium but failed to convert their chances, are pointless having also lost 1-0 to Iran and can not progress to the second round.
The goal woke Morocco out of their slumber and they quickly came to dominate the first half.More news: Trump targets another $200 billion in China imports with tariffs
More news: Trump threatens extra tariffs on US$200b of Chinese goods
More news: Neymar Ends World's Greatest Player Debate, Says "I Am The Best"
"You know, we have 22 other players than Cristiano", added Santos.
"I think we deserved a lot more".
But Portugal's supremacy was confined to the scoresheet because for possession, passes made and attempts on goal Morocco were the superior team.
The former Real Madrid man, who is no stranger to controversy, went down rather easily following a pat on the back from opposition defender Mehdi Benatia.
With both sides failing to win their opening Group B match, there was a tense atmosphere inside Luzhniki Stadium prior to kick-off.
The Moroccan team, however, was not lucky enough to score against the Portuguese squad after Cristiano Ronaldo's goal in the 4th minute of the match.