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Schalke's Christoph Metzelder: We need to take extra caution with Wayne Rooney

Schalke defender Christoph Metzelder is wary of the threat posed by Manchester United striker Wayne Rooney ahead of their Champions League semi-final clash on Tuesday.

The Bundesliga side are underdogs heading into the game, but they eliminated last year's winners Inter in the last round - a building block which could be fragmented by United, and Rooney.

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