Aston Vila skipper Ron Vlaar could be out of Holland's World Cup semifinal with Argentina.
Dutch officials say Vlaar has picked up a knee injury and is unlikely to be fit for the last-four showdown in Sao Paulo.
Doubts over Vlaar emerged on Sunday after their quarter-final win on penalties over Costa Rica.
If the 29-year-old misses out, it would be a big blow to Louis Van Gaal's heralded three-man back line, especially as defensive midfielder Nigel De Jong will miss the rest of the tournament with a groin injury.
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