Al Qaeda chief Ayman al-Zawahri described his late lieutenant Abu Yahya al-Libi as a "lion of jihad and knowledge”.
A militant website has published a video message from Abu Yahya al-Libi, whom US had reported as killed in a drone strike in Pakistan last week.
Ayman al-Zawahiri, considered the "operational brains" behind the 9/11 atrocities, is thought to be in Pakistan.
A US drone strike killed Libyan-born al Qaeda operative Abu Yahya al-Libi in Pakistan on Tuesday.
The killing of ``al Qaeda No 2``Abu Yahya al Libi is likely to result in a continuation of the decentralisation.
US Defence Secretary Leon Panetta had said that the US was fighting a war in the federally administered tribal areas of Pakistan.
Al Qaeda leader Abu Yahya al-Libi has been killed in a US drone strike in Pakistan.
Abu Yahya al-Libi, considered the most-prominent figure in al Qaeda after Ayman al-Zawahiri, carried a reward of $1 million on his head.
Pakistani security agents denied on Monday that an American al Qaeda spokesman wanted in the United States for treason had been arrested, saying there had been confusion over the identity of a detained suspect.
Day in Pics: 29th January
Showbiz World - January 29, 2015
President Barack Obama's speech at Siri Fort auditorium