The 24-year-old Uruguay international put pen to paper on a four-year contract after the two teams agreed an undisclosed fee. Schalke coach Mirko Slomka told club website www.schalke04.de that he is delighted to have secured the services of a goalscoring midfielder, as the club look to build on their second-placed Bundesliga finish last season.
"Carlos is a versatile midfielder who showed his attacking qualities with an impressive 12-goal haul last season," said Slomka.
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