The assertions were made by Shivanand Tiwary and senior party leader Jagdanand Singh.
Their denial came in the wake of special CBI court judge Shiv Pal Singh, before deferring the pronouncement on quantum of punishment on Lalu yesterday, commenting in his presence about him receiving phone calls from the RJD chief's well-wishers.
He also said "the possibility of our political opponents making such a call in the guise of RJD supporters cannot be ruled out. They may indulge in such mischief to queer the pitch for Lalu".
The RJD vice president expressed hope that "quantum of sentence in the instant case relates to withdrawal of money from Deogarh treasury will be less than the one awarded to him in 2013 since the amount involved in the present case is much smaller".
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Earlier, he was awarded five years imprisonment in 2013 in a case relating to fraudulent withdrawal of Rs 33.61 crore from the Chaibasa treasury.
The RJD supremo was later released on bail granted by the Supreme Court.
The RJD supremo's counsel have been pressing for "minimum punishment" in view of his old age and poor health.
Legal experts say that if the quantum of sentence happens to be less than three years, Prasad would be able to apply for bail immediately at the lower court itself.
Echoing Tiwary's views, senior RJD leader Jagdanand Singh told reporters separately "it is unlikely that any of Lalu's well-wishers will do something like this. Unless the judge sheds more light on the episode... discloses the identity of the callers, much can not be said on the issue".
Meanwhile, Bihar BJP spokesman Sanjay Singh Tiger alleged that the reports of calls to the judge showed that "RJD leaders were going to the extent of trying to put pressure on the judiciary to save their party supremo from facing the consequences of corruption".