Singh told at a press conference that he has not joined RLD just to contest in elections but he wants to see a change. Singh is contesting from Fatehpur Sikri in Uttar Pradesh.
Party leader Ajit Singh welcomed the duo into the RLD fold. However, confirming his support to the UPA government he also added, "We will continue our alliance with UPA. If we wanted to support NDA, we would have made the move a long time back."
His announcement came after the Congress reportedly told him to contest as an independent candidate.
Jaya Prada, a senior leader from Samajwadi Party has also decided to contest through RLD. Jaya will be fighting from Bijnor district of UP.
Amar Singh stated that "Development in UP is not possible without dividing it."
Singh and Jaya were expelled from the SP for indulging in anti-party activities and denting its socialist image.
Later, Singh formed Lok Manch and contested for 360 Assembly seats in UP in 2012. However, he could not win the elections.
The RLD is fighting the 2014 General Elections along with the Congress. It will contest from eight seats in Uttar Pradesh: Baghpat, Kairana, Bijnor, Nagina, Amroha, Hathras, Mathura and Bulandshahr.