Since 1996, Sasikala has always been under a cloud of "inquiry", Divakaran said in an apparent reference to a spate of corruption cases filed against Jayalalithaa and his sister, who was a close aide of the late leader, after the AIADMK lost the assembly elections that year.
"Amma (Jayalalithaa) utilised her fully, but went (died) without giving her any protection," he said without elaborating.
Divakaran's premises were also raided by I-T officials last week as part of multi-city searches of those associated with Sasikala.
On the recovery of pen drives and a laptop during an I-T search at Jayalalithaa's Poes Garden residence on Friday, he said, "I am away from the garden for a long time."
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Sidelined AIADMK leader TTV Dhinakaran, nephew of Divakaran, however, sought to downplay the latter's remarks on Sasikala.
"He must have made those comments (on Jayalalithaa not ensuring Sasikala's protection) out of anguish," he told reporters at Thanjavur.
I-T sleuths had conducted searches in the office block of the Poes Garden residence of Jayalalithaa, 'Veda Nilayam', days after raids at more than 180 locations.
Following inputs, a search operation was launched in the office block and a room used by Sasikala, who is now serving a jail term in connection with the Rs 66.65 crore disproportionate assets case.