U.S. stock futures traded flat Monday as investors continued to digest comments on interest rates from top Federal Reserve officials on Friday.

S&P 500 futures rose 0.03%, Dow Jones Industrial Average futures gained 0.01%, and Nasdaq futures declined 0.01%.

At a speech in Jackson Hole, Wyo., on Friday, Federal Reserve Chair Janet Yellen said the "case for a rate hike has strengthened in recent months."

Vice Chair Stanley Fischer, also on Friday, raised the prospect of a rate increase following the Fed's policy meeting next month.

The central bank hiked interest rates for the first time since the 2008 recession in December 2015.

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Stocks initially rose on Friday, following Yellen's comments, but ended the session mixed. London markets are closed Monday for a bank holiday. 

Personal income in the U.S. rose 0.4% in July, matching estimates. Consumer spending gained 0.3%, also in-line with estimates. 

Mylan (MYL) - Get Mylan N.V. (MYL) Report shares rose 2.5% in premarket trading after the company said it would start a generic version of the life-saving EpiPen. The company sparked a wave of controversy after raising the price of the drug last week by 400%. The generic version is said to be priced 50% less than the branded line. 

Herbalife (HLF) - Get Herbalife Nutrition Ltd. Report rose 3.1% in premarket trading after billionaire activist Carl Icahn late Friday reported that he had acquired 2.3 million additional shares of the nutritional supplements company.

Swiss drug maker Roche (RHHBY) said Monday that the Food and Drug Administration passed an Emergency Use Authorization for its Zika rRT-PCR test, which the company said helps detect the virus. Zika, which made landfall in the Miami area recently, has been linked to birth defects.

Carlyle (CG) - Get Carlyle Group L.P. Report is deciding if it should end its hedge fund business, according to a Financial Times report. One of its funds has lost some 90% of its value since 2014.