Tomas Kalas spent time on loan at Middlesbrough last season

Chelsea defender Tomas Kalas will rejoin Middlesbrough on loan for the entirety of next season, according to Sky sources.

The young Czech Republic international made 17 appearances as the Championship side just missed out on promotion from the Championship via the play-offs last season, losing to Norwich in the final at Wembley.

Middlesbrough were keen on another deal for Kalas for the new campaign and it is understood the paperwork on a season-long loan is now being finalised.