(Reuters) - CME Group Inc (CME.O) Chief Executive Officer Terry Duffy is recovering after a procedure to repair a collapsed lung, a spokeswoman for the exchange operator said on Wednesday.

The 58-year-old native Chicagoan, who is also chairman of CME's board, is recuperating at home and expected to be back in the office in a couple of weeks, spokeswoman Anita Liskey said.

The Chicago Mercantile Exchange Group, whose products include futures contracts on interest rates and commodities such as wheat and cocoa, is one of the largest bourse operators in the world.

(Reporting by John McCrank in New York; Editing by Lisa Von Ahn)