Chelsea are set to complete the signing of goalkeeper Djordje Petrovic from New England Revolution for £12.5m plus £1.5m in add-ons.
The 23-year-old Serbia international will compete with Robert Sanchez for the number one spot at Stamford Bridge.
It comes after Kepa Arrizabalaga left the club to join Real Madrid on loan while Edouard Mendy signed for Al-Ahli.
Petrovic has played 43 times in the MLS for New England Revolution and has two caps for Serbia.
Chelsea goalkeeper Marcus Bettinelli is currently out injured, while 20-year-old Lucas Bergstrom has been on Mauricio Pochettino's bench for the first two games of the Premier League season.