0751 GMT September 18, 2019
Ronaldo was injured 15 minutes into the 2-2 draw at the Camp Nou when he was caught by Barcelona defender Gerard Pique while scoring his team's first goal, ESPN reported.
He received treatment on the ankle, then played on until halftime, when he was replaced by Marco Asensio.
Madrid coach Zinedine Zidane said afterward that Ronaldo was worried 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.
Both Marca and AS reported that Ronaldo will not play in Madrid's game at Sevilla on Wednesday and against Celta Vigo on Saturday.
Madrid did not comment on Ronaldo's fitness after training on Monday, saying only in a statement that "players who started the match at the Camp Nou trained at a lower intensity," but Ronaldo is believed to have been at Valdebebas and working on his recovery.
The club did say, however, that Dani Carvajal, recovering after injuring a hamstring in the first leg of the Champions League semifinal at Bayern Munich on April 25, "worked alone out on the pitch both with and without the ball."
Ronaldo has had trouble with his right ankle before, including an operation in July 2008, when he was at Manchester United, and another injury after moving to Madrid the following summer that cost him two months early in the 2009-10 season.