Spain midfielder Sergio Busquets expects a heavy case of the butterflies ahead of his World Cup debut on Wednesday.

Busquets is to start the Group H opener against Switzerland in Durban.

Busquets says "until the moment arrives" he doesn't know how he'll feel to play, but "for sure I'm going to feel butterflies in my stomach" on the ride from the team hotel to the Moses Mabhida Stadium.

The 21-year-old Barcelona midfielder replaces midfielder Marcos Senna, a key member of Spain's European Championship winning team in 2008.

Busquets says: "I bring something different than Marcos Senna but the most important thing is that I complement the team."

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