Leicester paid Celtic nearly £9million in compensation when they hired Brendan Rodgers as manager in February.
The Northern Irishman's mid-season departure - with Celtic on course for a third consecutive domestic treble - was hugely controversial at Parkhead, with Rodgers vilified by supporters for his decision.
But Celtic's annual report revealed that Leicester had forked out £8.8million after persuading Rodgers to move to the King Power Stadium, where he is nearly nine months into a three-year contract worth about £5m per year.
Rodgers has transformed Leicester since he joined, to the extent that they can go second in the table - for a day at least - if they beat Arsenal on Saturday, as leaders Liverpool do not play second-placed Manchester City until the following day.
Sportsmail understands Rodgers is keen to implement a clear playing style across all teams at the club, from the first team through to the junior sides.
At present, Leicester's Under-23 side, run by Steve Beaglehole, are performing well in Premier League 2, with four wins and four draws from their opening 10 games leaving them fourth in the table.
They have won their last three matches in that competition and are also top of their group in the leasing.com Trophy, four points clear of second-placed Scunthorpe.
Yet Rodgers' vision is that all sides eventually mirror the first-team's style - a patient, passing game with the ball and intense pressing without it - to make it easier for young players to make the transition when required.