As per reports, Sisodia told media that due to busy schedule of prime minister, Modi will not be able to attend the oath taking ceremony.
"I would have been happy to attend, but I will not be able to," Sisodia quoted Modi as saying.
He spoke to reporters after he and Kejriwal met Modi at 7 Race Course Road here.
Kejriwal is scheduled to take oath Saturday at the sprawling Ramlila Maidan in the heart of the national capital.
Delhi Chief Minister-designate and AAP leader Arvind Kejriwal met Prime Minister Narendra Modi here on Thursday.
During his meeting with Modi, Kejriwal told the PM that it was an opportune time to grant full statehood to Delhi.
Kejriwal, along with party leader Manish Sisodia, on Wednesday met Urban Development Minister Venkaiah Naidu, Home Minister Rajnath Singh and called on President Pranab Mukherjee.
AAP leader Manish Sisodia, who had accompanied Kejriwal said: "We had a "chai pe charcha" over granting Delhi full statehood."
The Aam Aadmi Party had won 67 out of the 70 seats in the Delhi assembly polls leaving BJP with a mere three-seat win.
(With inputs from agencies)