Tiredness could ruin Barcelona's pursuit of treble success this season and offer Real Madrid hope of catching their arch-rivals to win the Primera Liga, former Real coach Fabio Capello has said.
The teams meet at the Bernabeu on Saturday, with Barca, who led by 12 points at one stage, now four points ahead of Real with five matches to play.
Pep Guardiola's side are still gunning for Champions League glory and also have a King's Cup final against Athletic Bilbao only two weeks away.
"There are too many finals and semi-finals. This is dangerous for a team," Capello told sports daily Marca on Wednesday.
"Although everyone says Barca have a squad of twenty-something players, the truth is there are very few who can really make a difference."
England manager Capello steered Real to an unlikely league title in 2007, when they came back to finish level on points with Frank Rijkaard's Barcelona taking the title on the head-to-head rule on the final day of the season.
Meanwhile, Madrid playmaker Guti has been ruled out of this weekend's Primera Division showdown with Barcelona because of injury.
The veteran midfielder damaged his left ankle during training today and, after being taken to hospital for tests, it was confirmed he would not be fit to face Barca. It is not yet known how many matches Guti will miss in total, however.