Real Madrid striker Ronaldo has suffered a minor injury setback.
The Brazilian World Cup winner strained a muscle in his left thigh.
"It is nothing serious," said Juan Carlos Hernandez, the Real Madrid club doctor.
"It is a little cramp in the muscle which could have been caused by the stress to the player in the last few weeks."
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Ronaldo yesterday completed a €45 million transfer from Italian club Inter Milan.
Speaking on Sunday, Ronaldo warned Madrid fans he needed time to regain full fitness.
"I need to prepare athletically - twenty days and I'll be ready to play," he said.