Tomáš Kalas is a Czech professional footballer who plays for Schalke 04 and the Czech Republic national team. He plays as a centre-back, but has also been played as a right-back. Having begun his career at Sigma Olomouc, Kalas signed for Chelsea for a reported £5.2 million in 2010. He spent most of his tenure out on loan, first back at Sigma, then at Vitesse Arnhem, 1. Wikipedia