Graham Potter is set to be appointed Chelsea manager in the next 24 hours, ending his three-year spell with Brighton.
Potter was at Brighton's training ground on Thursday morning but did not lead the team's session.
Chelsea hope to name a new manager before Saturday's game away to Fulham.
The club, currently sixth in the Premier League, has also held talks with former Tottenham manager Mauricio Pochettino and Sporting Lisbon head coach Ruben Amorim about the vacant role.
Brighton are planning a press conference on Friday ahead of Saturday's trip to Bournemouth, but it is not clear who will speak to the media.