The would-be CM's son came to Delhi to invite the two leaders of Sena's new ally Congress.
Shiv Sena leader Aaditya Thackeray separately met Congress president Sonia Gandhi and former prime minister Manmohan Singh on Wednesday night in New Delhi and invited them for his father Uddhav Thackeray's swearing-in as the Maharashtra chief minister on Thursday.
Aaditya Thackeray had a brief meeting with Gandhi at her 10, Janpath residence in New Delhi.
The Congress party tweeted a photo of the two leaders from its official Twitter handle.
Aaditya Thackeray invited Gandhi for Shiv Sena chief Uddhav Thackeray's swearing-in, which will take place at Shivaji Park in central Mumbai at 6.40 pm on Thursday.
Aaditya is the second Thackeray to visit 10, Janpath. In July, his uncle and Maharashtra Navnirman Sena (MNS) chief Raj Thackeray had met Gandhi at her residence to garner support for his demand to switch back to paper ballots while conducting elections.
From Gandhi's residence, Aaditya Thackeray reached Singh's residence and invited the former prime minister for the swearing-in ceremony of his father.
Later, Aaditya Thackeray told reporters that he met the two senior Congress leaders and sought their blessings.
Senior Sena leader and Uddhav Thackeray's close confidant Milind Narvekar was also with Aaditya during his meeting with the two leaders.
A decision was yet to be taken on whether the two leaders would attend the swearing-in ceremony in Mumbai, PTI reported.
However, leader of 'Maha Vikas Aghadi' led by Shiv Sena-NCP-Congress, Madhya Pradesh Chief Minister Kamal Nath will attend the event at Shivaji Park at 6.40 pm.
Congress interim president Sonia Gandhi, West Bengal Chief Minister Mamata Banerjee, Kejriwal, DMK president and Congress Chief Ministers have been invited for the swearing-in ceremony of Shiv Sena chief Uddhav Thackeray as Maharashtra Chief Minister.
ANI reported that Delhi CM and AAP leader Arvind Kejriwal may miss the event due to personal reasons.
Around 400 farmers from various districts of Maharashtra have been invited for Thackeray's swearing-in ceremony.
(With inputs from agencies)