Al Rayyan, Dec. 6 -- Speculation regarding the future of Portugal's Cristiano Ronaldo and his outburst following his substitution against South Korea were in sharp focus on Monday ahead of their World Cup last-16 game against Switzerland.

The forward, who left Manchester United by mutual consent last month following a controversial interview, was linked with a potential move to Saudi Arabia but Portugal coach Fernando Santos said he knew nothing about it.

"I have not spoken to him about this," Santos told a news conference ahead of Tuesday's game against the Swiss. "I don't know about this. It is his decision. I did not even know about this and I heard about this when I arrived here."

Ronaldo's future is unclear with several clubs arou...