If Jaswant Singh decides to contest, he may upset the equations against Sonaram as there are at least 1.5 lakh Rajput voters in Barmer constituency.
"He has influence over voters from other castes also, so Jaswant Singh will definitely make life difficult for the BJP candidate," said Vijay Sharma, a political analyst.
Voting for the 25 parliamentary constituencies in the state will take place April 17 and 24. In the last elections in 2009, the Congress won 20 seats and the BJP four, while one seat was won by an Independent.
Jaswant Singh hails from Jasol village in Barmer district.
He was member of the union cabinet during the NDA government.
