The 23-year-old Serbian international arrives at Stamford Bridge following the departures of Edouard Mendy, who joined Al-Ahli, and Kepa Arrizabalaga, who moved to Real Madrid on loan.
He will compete for a starting berth with Spain’s Robert Sanchez, who moved to Stamford Bridge earlier this month from Brighton & Hove Albion.
“I have always dreamed of joining one of the biggest clubs in the world. Today I have achieved that goal and I am very happy,” Petrovic said in a statement.
Petrovic left Serbian side Cukaricki for New England Revolution in April 2022 and made 48 appearances. He was nominated for the MLS Newcomer of the Year Award and MLS Goalkeeper of the Year Award.
(Reporting by Angelica Medina in Mexico City; Editing by Ken Ferris)