Citigroup appointed Roland Wikstrom as the head of U.S. G10 rates trading after the previous head Nicolas Brophy left the bank, a Citigroup spokesman said on Wednesday.

When asked, the spokesman declined to offer a reason for Brophy's departure.

Wikstrom's group trades the government debt and interest rates products of the Group of 10 industrialized countries.

(Reporting by Richard Leong; Editing by Chizu Nomiyama)