The Blues sent Juan Cuadrado to the Serie A giants at the beginning of last season in a complicated three-year loan deal.
Juve are paying the Blues £4.5m per season to keep the Colombian at the club.
They have also agreed to pay another £8.4m on top to make the move permanent at the end of the arrangement.
But included in the deal are a number of performance-related bonuses that are activated when the Italians win silverware.
And, according to Goal, if the Old Lady win domestic and European titles this season, they will owe the Premier League leaders a whopping £3.5m.
That is despite the fact that Cuadrado, 28, was only a substitute in each leg of Juventus’ Champions League semi-final victory over Monaco.
The winger moved to Stamford Bridge from Fiorentina in a £23.3m switch in 2015 but played just 15 times for then boss Jose Mourinho.
However, with Juve seven points clear at the top of Serie A and facing a Real Madrid in the Champions League final in Cardiff next month, they could be set to make a tidy profit on the flop deal.
Which means boss Chelsea Antonio Conte will be supporting his former team all the way.
If all add-ons are paid the Blue would stand to rake in in excess of £24m across the three-year loan.
And should Juve choose to sign Cuadrado at the end of next season the fee could rise to £32.4m.
Chelsea are not believed to have any option to recall the star from Juventus stadium.