England Under-21 stars Nathaniel Chalobah and Patrick Bamford will be joined by U19s midfielder John Swift in temporary moves away from Stamford Bridge, which Mourinho believes will prepare them to challenge for a first team place with the Blues.
Both Chalobah and Bamford have impressed during spells in the Championship last season, whilst this would be Swift’s first opportunity to leave the club on loan in order to help his development.
And England U17s pair Izzy Brown and Dom Solanke will also get a chance to catch the eye of Blues boss Mourinho, as they will be included in his squad’s training sessions this season whilst still playing for Chelsea’s Under-21s side.
The Portuguese says it’s all part of his Chelsea masterplan, with the loan players eventually returning to the club and being ready to go straight into the first team reckoning.
"We are going to have training with us, but also playing for the Under-21 team, [Dominic] Solanke, [Jeremie] Boga and [Izzy] Brown," revealed Mourinho, following their 2-1 win over NK Olimpija Ljubljana in Slovenia on Sunday.
"The other ones who are a bit older, 20 or 21, we feel they need to compete against men in a different league.
"People like Bamford, Swift, Chalobah - they are ready to go to other clubs and have a good loan.
"What we are trying to do, and we believe we are going to be successful, is in a few years’ time, when they are between 20 and 23, we will have them back at the right moment and in the first-team squad."
Midfielder Chalobah, 19, has been a regular for England at U16, U17, U19 and Under-21 level and featured for Watford, Nottingham Forest and Middlesbrough on loan over the last two seasons.
Meanwhile, former Nottingham Forest striker Bamford, 20, has been capped at U18, U19 and Under-21 level and been a regular scorer during spells with MK Dons and Derby County.
19-year-old Swift has also picked up multiple caps for England at U16, U17, U18 and U19 level, as well as helping Chelsea to lift The FA Youth Cup in 2012.