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The Brazil captain says even he is having sleepless nights ahead of Wednesday's final squad announcement for this summer's tournament

Brazil captain Thiago Silva has less reason than many to sweat over a potential World Cup role but the PSG defender says even he is losing sleep as the world waits to hear coach Luiz Felipe Scolari's final 23-man World Cup squad.

The 29-year-old enjoyed a fine Confederations Cup campaign and is among those already promised a role in the squad by Felipao.

But the former Fluminense stopper certainly isn't taking his selection as a given.

"The nerves and anxiety are mixing. My head is spinning," Thiago Silva told Globo.

"We know that we have a good chance of being called up after what we did at the Confederations Cup, but that provides little comfort. It's very complicated. I can not sleep.

"I spoke to David Luiz and he said he feels the same and so does Maicon."

Silva also spoke of the need for versatility in the group that will go in search of the Selecao's sixth world title, insisting those selected will have to provide a fine balance between defence and attack.

"We need players who bring the ball out from the back. The modern game calls it," he continued.

"We have Luiz Gustavo scoring and playing, Paulinho is almost a second striker. Teams that have big ambitions have to take risks. But a great profile of Scolari's teams is having offensive players who can also defend."

Scolari will announce his squad on Wednesday in Rio at 11:30am local time.