Feb 1 (Reuters) - Grupo Mexico (GMEXICOB.MX), the conglomerate controlled by billionaire German Larrea, has secured a $5 billion debt package for its proposed acquisition of Citigroup Inc's (C.N) retail operations in Mexico, according to people familiar with the matter. The move represents a major milestone in Grupo Mexico's efforts to put together the deal for Banamex, the unit that encompasses the Citigroup assets. Several banks, including Barclays Plc (BARC.L) and HSBC Holdings Plc (HSBA.L), have pledged to provide the debt financing, the sources said. Citi, Grupo Mexico, Barclays and HSBC declined to comment. Citi stepped back from conversations with Becker to prioritize a potential deal with Larrea, according to sources.

---