Barcelona entertain Celtic on Tuesday looking to maintain their winning start to Champions League group G with an in-form Lionel Messi.
Real Madrid kept Barcelona in their sights as an early goal from Karim Benzema put them on their way to a 2-0 win over Rayo Vallecano.
Real Madrid's La Liga match at Rayo Vallecano was postponed on Sunday after the floodlights failed amid reports of electrical cables being sabotaged.
Lionel Messi has inspired Champions League title holders Barcelona to a fifth successive semifinal appearance after their 3-1 win against AC Milan.
Real Madrid face Osasuna as they plot their route to La Liga success following commanding wins after two disappointing consecutive draws.
Cristiano Ronaldo is hoping a combination of his and Real Madrid's impressive form can help maintain their quest of bringing silverware back.
The final piece in the jigsaw has been found for Barcelona coach Pep Guardiola, who is now brimming with confidence ahead of the new season.
Pep Guardiola has been full of praise for Champions League final rivals Manchester United and refused to accept his side were the favourites.
Barcelona's two-time world player of the year Lionel Messi has dismissed suggestions that Manchester United lack quality.
Barcelona reached their second Champions League final in three years after a 1-1 draw with Real Madrid at the Nou Camp stadium.