Mukherjee, an engineer-turned politician, said he also wants to help work towards re-industrialising eastern India, which he feels can be the trade corridor for the country's Act East policy.
The newly inducted leader said that had he joined the TMC before the polls, it would have been construed that he switched allegiance for some post.
Television channels and a few newspapers had reported he would be joining the Trinamool Congress on Friday afternoon.
A small excerpt from the memoir 'The Presidential Years' had been released by Rupa Publications last week and was widely reported in the media.
Late President Pranab Mukherjee's son and daughter lock horns on Twitter over publication of his memoir
The late president’s son Abhijit Mukherjee, a former Congress MP, said on Twitter that he has written to the publishers asking them not to publish the book until he gives his nod.