Summary:
Barcelona's 'El Clasico' is the biggest fixture in Spanish football, according to Spanish media group Marca.

Full article:
By . Nik Simon . Follow @@Nik_Simon88 . Cristiano Ronaldo has been passed fit for Saturday's Madrid derby and the Portuguese superstar is hoping to be crowned king of the capital as Real Madrid take on Atletico Madrid in their La Liga clash. Real are trailing their local rivals after the opening two rounds, but they are hoping to win back the bragging rights after seeing Atletico lift last season's trophy. While Real vs Barcelona, otherwise known as 'El Clasico', has traditionally been regarded as the most important match in Spanish football, Marca have now begun to label the Madrid derby as the biggest fixture. Cristiano Ronaldo has been passed fit for Saturday's Madrid derby between Real and Atletico . Real Madrid vs Atletico Madrid is described as 'the biggest', while Barcelona prepare to change colours . Barcelona will extend their lead at the top if they beat Athletic, although it will be an unusual setting at the Nou Camp as the Catalans ditch their club colours for the 'cuatribarrada'. In La Liga, Carlos Tevez is doubtful for Juventus's Serie A clash with Udinese. There are also reports that Serie A will be reduced to 18 teams in three years time. Juventus and Roma both return to Serie A action, but there are doubts over Carlos Tevez's fitness . Serie A could be reduced to 18 teams in three years time, according to reports in Italy .