Chelsea have agreed to loan both Tomas Kalas and Nathan Ake to Middlesbrough for next season, according to the London Evening Standard.
Defender Tomas Kalas, 22, spent the latter stages of last term at The Riverside and it is believed that he will return to the North East in the near future.
He will be joined by 20-year-old club teammate Nathan Ake, who has made 12 senior appearances for the Blues.
In April, the midfielder spent four weeks in the Championship with Reading.