How injured is Cristiano Ronaldo? The Real Madrid player has fans worried after he left Tuesday night's Super Cup after the first half.

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Real Madrid manager Carlo Ancelotti confirmed that Ronaldo will be going for tests after he was seen clutching his back during the game. "Cristiano had strain and was not comfortable. Tests tomorrow. At first it does not seem so serious," he told The Daily Mail.

Ronaldo previously suffered a knee injury during the summer's World Cup where he played for Portugal. Goal.com reported last week that Real Madrid was worried Ronaldo would try to out-do himself this season after his injuries.

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"Cristiano always wants to play and it's that competitive streak that makes him the player he is, but he knows he will need to rest more to avoid a constant recurrence of this problem," a source close to Madrid told Goal.com. "The club are delighted to see him training at full pace as he has in previous years, but there is still some concern over how he will respond over the whole season."

During the World Cup, Ronaldo was "looking well below his peak fitness and avoiding sprints as he appeared afraid of pushing his fragile frame to its limits." Ronaldo played during the all-Spanish UEFA Super Cup against Sevilla, which Real Madrid won. Ronaldo scored two goals. Ronaldo posted a solo picture with the Super Cup trophy after the win. "UEFA SuperCup Champions #RealMadridSevilla #HalaMadrid #SuperCup @realmadrid".

Tags: Cristiano Ronaldo