WASHINGTON (Reuters) - A senior Federal Reserve official said on Friday that the U.S. central bank's eventual exit from aggressive monetary action to spur the economy could be complicated if bond yields began to shoot up in anticipation of tighter policy.

"One of my concerns about our policies, particularly our large balance sheet, is the dangers and risks we face when the time comes to exit," Philadelphia Federal Reserve President Charles Plosser told Bloomberg Television.

"I think there could be many challenges for us at that time and if we get it wrong the damage might be significant...if markets get way ahead of us, and long-term rates spike and go up very rapidly, our ability to manage a smooth exit may be really put to the test," said Plosser, who is not a voting member of the Fed's policy-setting committee this year.

(Reporting By Alister Bull; Editing by Chizu Nomiyama)