Jerry del Missier told a Parliamentary committee on Monday that he drew that conclusion from a conversation with the bank's chief executive, Bob Diamond. He insisted that he believed he had done nothing wrong.
Del Missier resigned as Barclays' chief operating officer on July 3, hours after Diamond resigned.
Barclays has been fined $453m by U.S. and British agencies for submitting false reports of its interbank borrowing rates, data which goes into the calculation of a key market index, the London interbank offered rate (LIBOR).