By Dan Freed

NEW YORK (Reuters) -- Citigroup Inc will take a $300 million "repositioning charge" in the fourth quarter to "resize infrastructure and capacity" throughout its businesses, Chief Financial Officer John Gerspach said on Wednesday.

Citi will also add $300 million to $400 million in loan reserves from the third quarter for energy loans, based on the expectation that oil prices will remain low, Gerspach told the Goldman Sachs U.S. financial services conference.

Depressed oil prices have put several U.S. banks under pressure because of their exposure to loans to oil companies.

Citi is due to report fourth-quarter earnings on Jan. 15.

"From an expense point of view, we will be taking a repositioning charge of say about $300 million in Citicorp in the fourth quarter," Gerspach said. "That is as we continue to resize our infrastructure and our capacity to deal with a continuing low-revenue environment."

Gerspach declined to comment when asked about investment banking bonuses, saying Citi would "pay competitively".

The last time Citi took a repositioning charge as large as this was in the fourth quarter of 2014, said Barclays analyst Jason Goldberg. At that time, the charge was $655 million.

Morgan Stanley (MS.N) said on Tuesday it would take a $150 million severance charge related to workforce reductions in the fourth quarter.

The investment bank is cutting 1,200 workers worldwide, a source told Reuters, as tougher capital rules and mounting competition force it to improve profitability, following one of its slowest quarters for bond trading since the 2008 crisis.

Gerspach also said Citigroup would need to issue $10 billion to $15 billion in net new debt to comply with new rules designed to help banks better weather a crisis.

Speaking at the same conference, Bank of America (BAC.N) Chief Executive Brian Moynihan responded to a question about whether its new debt issuance under the rules would be $15 billion, by saying the number was in the "right ballpark."

Wells Fargo & Co (WFC.N) said last month it would likely need to issue an additional $40 billion to $60 billion of long-term debt to comply with the rules.

The rules, proposed by the Federal Reserve on Oct. 30, aim to ensure that some of the biggest and most interconnected U.S. banks have enough equity capital and long-term debt to withstand crises.

(Reporting by Richa Naidu and Rachel Chitra; Editing by Ted Kerr, Savio D'Souza and Peter Cooney)