Leo Messi shoots free-kick but hits wall in Barca vs. PSG
Ronaldo and Messi have both been in stunning form this season, scoring 71 goals between them.
Their stunning individual performances have helped Real Madrid and Barcelona up to first and second in the La Liga table respectively.
However, for Messi, it has been a different story on the international stage.
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Cristiano Ronaldo and Lionel Messi have been praised by Juan Roman Riquelme
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Cristiano Ronaldo has inspired Real Madrid to the top of the La Liga table
While Ronaldo has scored seven goals from four games for Portugal, Messi has managed just one for Argentina.
And Riquelme believes Argentina and Real Madrid struggle whenever their best players are sidelined.
"Argentina without Messi is a normal team, but this of course the best player in the world," the ex-Barcelona player told Chilean TV station Canal 13.
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Juan Riquelme believes Argentina are normal without Lionel Messi
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"The same thing would happen to Real Madrid without Cristiano Ronaldo."
Both players are currently vying for the Golden Shoe award to become Europe's top scorer.
Messi is winning that race with 23 league goals, two more than Andrea Belotti, Bas Dost and Pierre-Emerick Aubameyang.