Chelsea have agreed a deal with Middlesbrough to loan them Tomas Kalas and Nathan Ake for next season.

Kalas has already been loaned out six times, including to Middlesbrough earlier this year, since joining Chelsea as a 17-year-old from Sigma Olomouc in 2010.

The Czech Republic international defender has made just four appearances for Chelsea, one of which was in the 2-0 League win at Liverpool last year.

Ake is also on his way to Aitor Karanka's side to continue his development. The 20-year-old, who can play as a left back and in midfield, has made 12 appearances for Chelsea so far.

Mourinho rates him highly but wants to see how he will cope with the rigours of playing on a weekly basis at a top club in the Championship.

The Holland Under-21 international already had a taste of what it's like after spending a month at Reading between March and April.

The future of another academy starlet, Charly Musonda, is also close to being resolved.

Musonda has yet to play for the first team, but has been strongly linked with several European clubs, including Arsenal and Manchester City.

Chelsea don't want to sell the Belgium Under-21 international, who played a key role in the club winning the Uefa Youth League and FA Youth Cup earlier this year.

It is understood Musonda also still hopes to make it at Stamford Bridge so is only interested in leaving on loan.

The 18-year-old has already rejected a switch to Chelsea's long-term partner Vitesse Arnhem and is close to agreeing a move to Marseille, despite the interest from Valencia and Roma.