The Federal Housing Finance Agency plans to propose new financial requirements next week for Fannie Mae, Freddie Mac and the 12 Federal Home Loan Banks.

The regulatory agency may place new restrictions on Fannie and Freddie’s investments and will revamp capital requirements for the home loan banks, Director James Lockhart said in an interview with Bloomberg.

Under draft regulations, the agency will determine the “size and composition” of Fannie and Freddie’s $1.7 trillion combined mortgage portfolios, Lockhart said. He said his agency also plans to release new minimum capital rules for the 12 regional Federal Home Loan Banks by Jan. 27, as called for by Congress when it enacted legislation last July to strengthen oversight.

Fannie and Freddie, the two largest sources of mortgage money in the United States, were placed under federal control in September after regulators said the two were at risk of failing. The U.S. Treasury Department, which pledged as much as $100 billion for each company to keep them solvent, pumped $13.8 billion into Freddie in November.

“They will be reporting numbers in mid- to late February and, yes, I think everybody would expect that there would be a draw on Treasury,” Lockhart said of the prospect that one or both of the companies will need federal aid after they announce fourth-quarter earnings.

The Federal Home Loan Bank system is the largest U.S. borrower after the federal government, with $1.25 trillion of debt. The banks provide low-cost loans to more than 8,000 member banks and finance companies, including Bank of America Corp., Citigroup Inc. and JPMorgan Chase & Co.

As many as eight of the regional banks may fall short of minimum capital requirements as auditors require write-downs from their $76 billion of private mortgage-bond holdings to market prices, Moody’s Investors Service said this month.