Ronaldo scored a hat-trick in Portugal's 3-3 draw with Spain in their first World Cup game on Friday while Silva came on from the bench in the 80th minute.

"Cristiano Ronaldo is our captain. I am positioned where I should be when I play alongside him. The same goes for him - he is always in sight. We try to act together. We managed to do just that in the past and I hope it will continue like that," Silva told journalists.

He added that it is an honour playing with Ronaldo as he is the best footballer in the world, who makes his teammates' lives easier with his assists as well as goals.

Reigning European champions Portugal will face Morocco at the 78,000-seater Luzhniki Stadium in Moscow on Wednesday.