Chelsea moved swiftly to land Potter after calling time on Tuchel's reign on Wednesday morning.
Chelsea have named Graham Potter as new coach of the club.
Potter signed a five-year deal and will take charge of Saturday's trip to Fulham after agreeing to succeed Thomas Tuchel, the club said on its website.
'I am incredibly proud and excited to represent Chelsea FC, this fantastic football club,' Potter said.
'I am very excited to partner with Chelsea's new ownership group and look forward to meeting and working with the exciting group of players and to develop a team and culture that our amazing fans can be proud of.
'I would also like to place my sincere thanks to Brighton & Hove Albion for allowing me this opportunity and in particular Tony Bloom and all the players, staff and supporters for their continued support during my time at the club.'
Chelsea moved swiftly to land Potter after calling time on Tuchel's reign on Wednesday morning.