Madrid coach Zinedine Zidane said afterwards that Ronaldo was anxious as the joint had swollen, but said that ahead of tests to be carried out on Monday, Ronaldo was confident there was no serious injury.
"It doesn't feel good right now, but I think it's going to be small [problem], it's just a knock", he said after the game, as quoted by Marca. "We will have him ready (to play)".
Ronaldo scored Madrid's equaliser after 15 minutes but received a kick from Gerard Pique as he tapped home on the line.
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Ronaldo could now be rested for Madrid's final three league games of the season, which come against Sevilla, Celta Vigo and Villarreal. Ronaldo will then join Portugal at the World Cup next month.
An ankle injury forced the Portuguese superstar off at half-time and there were fears that he could miss the Champions League final. "We're not anxious about the final, we're all going to be there".
"I can't say how long he'll be out for, tomorrow he'll have a scan, but I think it'll be a small thing for him".
"We will see what we have to do, and the damage that has been done".