Middlesbrough have signed Chelsea defender Tomas Kalas on-loan to June.

Kalas recently returned from a loan spell at German side FC Koln in the Bundesliga and will now play for Aitor Karanka's side in the Championship.

The Chelsea defender made his debut for the Blues during their 2-0 win against Liverpool at Anfield last season in one of his two appearances for the senior side.

Striker Patrick Bamford is already on loan at Boro for the season as is Kenneth Omeruo, who featured at the World Cup with Nigeria last summer.