Marc Cucurella's move to Chelsea is on the verge of completion in a deal worth up to £62million.
The Brighton defender completed a medical with the west London side in the capital on Thursday.
Versatile Spanish star Cucurella, 24, is set to make the switch for an initial £55m, plus a potential £7m in bonuses.
In a separate but connected deal, Blues centre half Levi Colwill is expected to join Brighton on loan for the season.
It is understood the initial delay in confirming Cucurella's move to Chelsea was being held up by negotiations over the terms of Colwill's move to Graham Potter's side.