Celtic are keeping tabs on Chelsea centre-back Tomas Kalas.
The Scottish Sun reports that both Celtic and Rangers have watched the 25-year-old over the past fortnight. It's said that Kalas is high on a list of transfer targets drawn up by Celtic manager Neil Lennon.
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Kalas, currently on loan from Chelsea at Bristol City, has played 27 times in the Championship this season, catching the eye of many with his performances. Bristol currently sit just outside the league's playoff places.
The Czech Republic international joined Chelsea aged 16. He has since spent time on loan at seven clubs including at Middlesbrough and Fulham.
Kalas, who is Chelsea's longest-serving player, would cost around £5 million.
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