The add-ons in the £115 million deal taking Moises Caicedo from Brighton to Chelsea have been revealed.
Chelsea have agreed a British record £115 million fee with Brighton for Caicedo, who will undergo a medical ahead of completing his move.
He rejected the chance to join Liverpool - who agreed a £111 deal with Brighton, as he prefers a move to Stamford Bridge.
The Blues are understood to be paying an initial £100 million, plus £15 million in performance-related add-ons.
The fee surpasses the £107 million Chelsea paid for Enzo Fernandez when breaking the British record transfer in January.
According to David Ornstein, the add-ons in the deal agreed with Chelsea are seen as very 'achievable'.
Brighton expect them swiftly as Chelsea offered more guaranteed money up front than Liverpool.
As for the add-ons, one third is based on European qualification this season and two thirds is based on appearances.
Brighton will also have a sell-on clause that has been described as 'significant' as part of the deal to sell their prized asset.
Mauricio Pochettino will be looking to pair the 21-year-old with Enzo Fernandez, who starred in midfield against Liverpool.
The Ecuador international wasn't included in Brighton's matchday squad for their Premier League opener against Luton Town last Saturday.
Chelsea, who had hoped to unveil their new signing in their opener, drew 1-1 with Liverpool as Axel Disasi cancelled out Luis Diaz's opener.
Caicedo could make his debut for his new club on Sunday when Chelsea resume their campaign against West Ham United.