Citigroup Inc.'s Global Transaction Services business has expanded its commercial card services to clients in Greece and Luxembourg.

The additions bring the number of markets in which Citi's global card services has a presence to more than 50.

"We have expanded our market coverage by 10 countries over the last year and also expanded our solution set and service infrastructure in response to client demand," Manish Kohli, the head of wholesale cards for Europe, the Middle East and Africa, said in a press release Thursday.

Citi plans to expand its commercial cards services to the United Arab Emirates by the end of the year, Kohli said.