July 10 (Reuters) - Ignacio Gutierrez-Orrantia, one of Citigroup's (C.N) top bankers in Europe, will remain at the bank, sources familiar with the matter told Reuters on Tuesday, following media reports that he was set to join Spanish power utility Naturgy (NTGY.MC) as CEO. On Sunday, he had called Naturgy's chairman and CEO Francisco Reynes, two of the people said. Naturgy and Citi declined to comment. After rival Iberdrola (IBE.MC) appointed Armando Martinez as CEO last year, Naturgy’s leadership structure, with the power concentrated in the hands of Reynes, had become an anomaly among large Spanish energy companies. Reporting by Pietro Lombardi, Jesus Aguado and Andres Gonzalez Editing by Mark PotterOur Standards: The Thomson Reuters Trust Principles.

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Persons: Ignacio Gutierrez, Gutierrez, Citigroup's, Francisco Reynes, Naturgy, Iberdrola, Armando Martinez, Pietro Lombardi, Jesus Aguado, Andres Gonzalez, Mark Potter Organizations: Reuters, Citi, Thomson Locations: Europe, Spanish, Middle East, Africa