In contrast, Uruguay march on with arguably the best defence in global football and one of the best strike pairings anywhere.
Suarez spoke at a press conference after the session and, in quotes reported by goal.com, the Barcelona forward said of Cavani: "The two goals he scored the other day, the team work he has in general, his physical exertion...all of it is important".
Portugal won the 2016 European Championship and came to Russian Federation with high expectations following the surprise title in France two years ago, its first in a major tournament.
Cavani was also the top scorer for Uruguay during their World Cup qualifying campaign with 10 goals and finished ahead of players such as Argentina's Messi, who had seven, and Brazil's Neymar, who had six.
Portugal were knocked out at the hands of Uruguay after Edinson Cavani's brace ensured a 2-1 passage to the quarter-finals.
The first match of the day will be played between France and Argentina in Kazan at 7.30 this evening while Uruguay will meet Portugal in Sochi later at 11.30 tonight. "That's why Uruguay has to be congratulated".
Portugal coach Fernando Santos was hopeful that the Real Madrid man will continue to represent his country for some time yet, with Portugal's next challenge to defend the European Championship title they won in France two years ago.More news: Trump plans to hold talks with Putin "tete-a-tete"
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"Cristiano still has a lot to give to football", Santos said.
"Ronaldo is a great player but I am confident with our defence and how the team are doing".
Speaking after the Portugal game, Cavani had said: "I hope it's nothing".
Messi's return in Russian Federation was more meagre. Among the youngsters expected to keep Portugal contending are midfielder Bernardo Silva and forwards Andre Silva, Goncalo Guedes and Gelson Martins, who are all 23 or younger.
The Paris Saint-Germain striker suffered a hamstring injury in the last-16 win over Portugal and was the only player not to take part in team training in Nizhny Novgorod on Tuesday.
Deprived of the chance to play at this stage of the last World Cup after being suspended for his infamous bite on Italy's Giorgio Chiellini, Suarez will lead the Uruguay line at the Fisht Stadium alongside Edinson Cavani.
Ronaldo will be almost 38 by the time the next World Cup comes around in Qatar in 2022.