The top 2 teams that emerge from each group will face each other at the semi-finals.
The pair don't appear to have any past history, although the Real Madrid striker did bring an end to Bayern Munich's UEFA Champions League chances earlier this term.
"Chile has very good quality players, very dynamic, very strong team spirit", Santos told reporters on Tuesday.
"I have already told my Bayern Munich teammate (and Germany international) Joshua Kimmich that we will meet again in the final!"
Chile secured a place in the last four with a draw against Australia on Sunday as they finished second in Group B behind world champions Germany.
After steering Portugal to the Euro 2016 title in Paris a year ago, Ronaldo will want to claim a second worldwide title in Monday morning's Confederations Cup final in St Petersburg, against Mexico or Germany who meet in the other semi-final on Friday morning.
Alexis Sanchez has possibly the most famous thighs in football - the sight of the Arsenal and Chile forward rolling up his shorts to show them off is a familiar sight.
"It was a hard pitch where the grass was somewhat too long and it was nearly impossible to play better than we did", he told Portuguese media after picking up his third successive man-of-the-match award.
Denied victory by Javier Hernandez's injury-time equaliser against Mexico in the opening match, Portugal knew their destiny would probably come down to defeating Russian Federation on home soil, a task they proved more than capable of after Cristiano Ronaldo's early victor.
This time Ronaldo was thrown by the Chilean midfielder Artoro Vidal! "For me he does not exist", he said. Compared to the Portuguese superstar in Real Madrid, with a smart ass.
Portugal could be without Manchester City new boy Bernardo Silva for the meeting.
But Liverpool midfielder Can believes Germany are well equipped to cope with the Liga and Champions League victor, who scored a remarkable 55 goals in 54 matches for club and country last term despite starting his season late due to injury on September 10.
Death toll from Pakistan attacks climbs to 73
Provincial government spokesperson Anwar-ul Haq Kakar said it was likely that the attacker wanted to target the IGP's office. A faction of Pakistan-based militant group Lashkar-e-Jhangvi on Saturday claimed responsibility for the Parachinar attacks.
Beyonce gives birth to twins
The Grammy victor singer revealed that she was pregnant with two back in early February with an Instagram post. Confirming that she was expecting twins Beyonce wrote: "We would like to share our love and happiness".