Emerson signed with West Ham United in August 2022 from  Chelsea.

He began his career with Santos before going to Italy as a teenager, first with Palermo and later with AS Roma, becoming an Italian citizen and making his debut for his new nation in September 2018.

Emerson became the first player to complete the set of senior UEFA winner’s medals when West Ham won the UEFA Europa Conference League in June 2023, after winning the UEFA Champions League, UEFA Europa League, UEFA Super Cup and FA Cup with Chelsea and the UEFA European Championship with Italy.