Kalas joined Chelsea from his hometown club Sigma Olomouc in 2010, and spent the next two seasons on loan at Dutch side Vitesse Arnhem.
He made his Chelsea debut during the 2013-14 season, and went on to make four appearances in all competitions, before further loan spells at FC Cologne in Germany and Middlesbrough.
(Reporting by Simon Jennings in Bengaluru,; Editing by Christian Radnedge)
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