"I can tell you that LJP will strengthen UPA. The tie-up with RJD will make us a strong force in Bihar," Paswan said in New Delhi after attending a meeting of leaders of LJP and Jan Morcha party.
Despite Lalu's differences on seat sharing with the Congress, Paswan maintained that he is looking to strengthen the UPA.
"I would say that people may contest the elections from wherever they feel but it is important that they do not create any bitterness among the UPA," Paswan said.
"Everyone is trying to strengthen his party but UPA should not disintegrate and should be strengthened," he added.
Paswan ruled out joining the Third front as a possible option after the polls and stated it will remain a "closed option" for his party even after the elections.
"UPA will form the government despite there being no pre-poll alliance, some parties may win less seats and some more, but after the poll, alliances will be done to strengthen the UPA," Paswan said.
He said the party will declare its list of candidates for Bihar, Uttar Pradesh and Jharkhand within two days.