Though he has physically improved, his doctors remained unsure of his mental functioning.
Although Roy has remained tightlipped about the agenda of his visit, the political circles in West Bengal were abuzz with speculations over his next political move.
He had a contingent of about 22-24 armed CRPF commandos who used to move with him every time he travelled in West Bengal.
Banerjee, who was speaking to reporters at West Bengal's state secretariat, said that her party's name will remain the All India Trinamool Congress.
The West Bengal government has tied up with the Indian Institute of Management, Calcutta, to launch a reality show, Egiye Bangla.
The TMC likened its MLAs who have joined the BJP to "rats abandoning a ship sensing danger".