All necessary arrangements have been made at the AIIMS trauma centre and the Safdurjung hospital "as directed by the Union health minister", the official said.
"About nine patients are likely to be shifted here today," he added.
A Safdurjung Hospital source said they are likely to be flown in in a defence aircraft.
Earlier in the day, the NTPC said in a statement the toll in the massive explosion in the boiler at the state-run power giant NTPC's Unchahar plant has reached 29, while 85 are being treated at hospitals in Raebareli and Lucknow.
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Chief Minister Yogi Adityanath, who is abroad, had announced Rs 2 lakh compensation for the family of those killed and Rs 50,000 for the grievously injured, besides Rs 25,000 for other injured workers.
The NTPC has initiated a probe to ascertain the reasons behind the blast.
In a statement, the NTPC has said that at unit number 6 of its Unchahar plant, there was a sudden abnormal sound at 20-meter elevation around 3:30 on Wednesday afternoon.
The 1,550-MW plant supplies electricity to nine states, according to officials, and employs around 870 people.