Citigroup Inc.'s Manuel Medina-Mora, head of consumer banking and chairman of the company's troubled Mexico unit, is preparing to leave in coming months, according to people with knowledge of the situation.

The details of Mr. Medina-Mora's possible departure haven't been finalized and could change, but people familiar with the bank's thinking say he will leave or announce his departure by early next year.

Several board members have pushed this year for the 64-year-old Mr. Medina-Mora to leave, three people said. But Chief Executive Officer Michael Corbat and Chairman Michael O'Neill have been supportive of the executive, two other people said.

Mr. Medina-Mora's exit would come after a tough year for Citigroup's Mexico unit, known as Banamex. The business was once a crown jewel for Citigroup, buoying the bank through the 2008 financial crisis.

It also helped Mr. Medina-Mora gain a foothold on Citigroup's corporate ladder, so much so that he was once considered a contender for CEO.

But this year, the unit has been dragged down by disclosures of alleged fraud, a particularly sensitive point for a bank already under the intense scrutiny of regulators.

That and struggles at Citigroup's consumer business elsewhere have put a mark on the career of Mr. Medina-Mora and caused concerns among board members.

The bank declined to make Mr. Medina-Mora available for comment on Tuesday. "Manuel Medina-Mora is a highly valued and well-respected member of the management team, who has an outstanding track record globally in consumer banking, as today's results show."

Citigroup on Tuesday disclosed more troubles at Banamex, announcing that it was shutting down a unit that offered personal-security services for executives.

Citigroup said it had discovered that employees at the unit had improperly provided services to people outside Banamex, and people with knowledge of the situation said employees also had bought audio files of illegally intercepted phone calls. Earlier this year, Citigroup said Banamex had been duped in an alleged accounting fraud by the oil-services firm Oceanografía which resulted in a pretax loss of about $400 million.

Oceanografía hasn't been charged with wrongdoing. After nearly two months under house arrest, Oceanografía CEO and controlling shareholder Amado Yáñez Osuna was released in early June on $6.2 million bail. Mr. Yáñez, who is facing charges of bank fraud in Mexico, hasn't made any comments on the matter.

The bank never said it blamed Mr. Medina-Mora for those troubles. He has continued to be a strong presence at Banamex even as his role expanded globally and his job took him from Mexico City to New York.

Some board members are using the recent discovery of alleged improprieties at the personal-security unit to turn up the pressure on Mr. Medina-Mora, said people close to the situation. But Mr. Medina-Mora also had been telling colleagues that he was thinking about retiring, according to people with knowledge of the matter.

Several Banamex executives have already departed, including people close to Mr. Medina-Mora. Earlier this month, Banamex CEO Javier Arrigunaga stepped down.

The bank recently named Michael Helfer, Citigroup's former vice chairman, to the Banamex board, appointed veteran Citigroup banker Rodrigo Zorrilla to be Banamex's president, and Mr. Corbat said Tuesday Citigroup has strengthened controls in its Mexico operations.

Citigroup bought Banamex, then run by Mr. Medina-Mora, in 2001. The New York bank was eager to expand in a fast-growing country and to benefit from the well-known Banamex name. Citigroup paid a premium to persuade Banamex to sell itself, and, according to several people, agreed to let the bank operate with a unique degree of autonomy

Citigroup, in announcing a third-quarter profit rise of 6.6%, on Tuesday, said it would ratchet back some of its international consumer operations, saying it would exit from 11 countries, including El Salvador and Guatemala.

The move is part of an agenda laid out by Mr. Corbat to focus on wealthier customers in fast-growing countries--and to make the bank more manageable and less risky in the eyes of regulators.

Citigroup's struggles in Mexico in particular highlight the difficulties of running a sprawling global empire.

Mr. Medina-Mora's banking career started in 1971, when he was 21 years old. He followed a grandfather and uncle to Banamex and worked his way up to the job of Banamex chief executive in 1996.

"When I entered the bank very young, I proposed this to myself: You could become the chief executive of the bank one day. And that was my professional objective," Mr. Medina-Mora said in a videotaped interview last year with the Mexican website DCHIC.

Colleagues and competitors have praised Mr. Medina-Mora's discipline and drive. His extensive experience in retail banking also set him apart at a bank that has long emphasized services for institutional customers.

After selling to Citigroup, Mr. Medina-Mora climbed through Citigroup's ranks.

He polished his image, shedding eyeglasses and hiring a personal trainer. Other bank executives say he is skilled at making presentations and networking.

He also enjoyed the spotlight and was viewed as a celebrity by the rank and file in Mexico. A caricature of Mr. Medina-Mora holding a little red umbrella--a former Citigroup logo--adorns a wall of his Mexico City office.

Branch employees would line up for photos with him when he traveled, according to employees. After Citigroup changed the retirement package for Banamex employees last year, he organized a lunch for the nearly two dozen older executives who opted to depart. One attendee remembers Mr. Medina-Mora naming each director by name and area, thanking them personally for their service to the bank.

Mr. Medina-Mora had wanted the Citigroup CEO job, but his odds slipped after his ally, CEO Charles Prince, resigned under pressure in 2007, according to people familiar with the matter. Mr. Medina-Mora never cracked the inner circles of the next CEO, Vikram Pandit, or Mr. Corbat, according to some of the people.

Among strikes against him, Mr. Medina-Mora refused to loosen his control of the Mexican operation, often touting Banamex's profits as a constant bright spot among Citigroup's global troubles, according to people who worked with him.

His constant travels back to Mexico spread him too thin, people said, and he failed to empower local executives at Banamex. He has insisted that information be channeled through him, they say, creating bottlenecks for the business.

Mr. Medina-Mora sent a note to employees Tuesday after the bank reported earnings, noting that the global consumer bank's revenue and net income were up over the year.

As for the 11 countries where the bank is exiting from consumer operations, Mr. Medina-Mora wrote, "We wish you continued success."

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