The Federal Reserve could find itself challenged to raise U.S. interest rates this year as global growth remains sluggish and inflation subdued, closely watched bond investor Bill Gross said on Monday.

“With the dollar strengthening and oil prices declining, it is hard to see even the Fed raising short rates until late in 2015, if at all,” said Gross, who oversees the Janus Global Unconstrained Bond Fund, in a collection of investment views posted online by Janus Capital Group.

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