"This is because a question has arisen among some people if Jayalalithaa had (actually) signed the file and rendered advice (regarding) allotting her portfolios to Finance Minister Panneerselvam," Karunanidhi said in a statement here.
"The Governor's communique yesterday that this (portfolios' allocation) has been done on the advice of Chief Minister is surprising," he said.
His views come a day after his party treasurer and son M K Stalin welcomed the allocation of portfolios held by Jayalalithaa to her trusted aide.
There was no official statement from the government though she has been hospitalised for the past 19 days and it has also been said that she may have to stay in the hospital for a longer period, he said.
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He said the announcement that Panneerselvam will take care of Jayalalithaa's portfolios can be "accepted" as an arrangement for "administrative convenience".
The "suspicion whether the Governor had fully considered all the dimensions of the Constitution...Before giving his nod for the new arrangement cannot be fully ignored," he added.