Frank Arnesen was always confident that his youth development policy at Chelsea would produce positive results.
The former Tottenham sporting director moved to Stamford Bridge in 2005 as part of billionaire owner Roman Abramovich's revolution.
Critics suggested that, amongst a number of expensive signings, Chelsea were only putting on a front of a dedication to encourage home-grown talent.
But Arnesen insists that the target was always to have youngsters emerging in the first team in the current season and he is pleased with the progress of the likes of 17-year-old Josh McEachran.
Arnesen said in The Sun: "We knew when I came the aim in 2010/11 was to have at least one player in the first team.
"I've always been supported from inside the club.
"Roman has been unbelievable. There have been pressures from the outside but Roman said, 'Frank I know what you said when you came. We have an agreement, you carry on.'
"I was quite comfortable that one day it'd come right.
"I wasn't expecting players to come through two years ago - they were too young and this is one of the world's best clubs.
"You can't usually expect them to get through at that age. Now they are around 19 and 20, with the exception of Josh.
"Can they stay in there? It is up to them, this is just the beginning."
Arnesen added: "Let them develop, let them make mistakes and don't make them heroes so young. It can only be bad, nothing else."