Bihar's Robinhood Pandey, as he is nicknamed, however, seemed undaunted by the party's decision as he asked his well-wishers to be patient.
Pandey had recently joined the JD(U) for which he was given the primary membership by chief minister Nitish Kumar.
Senior Maharashtra BJP leader Fadnavis is his partys poll in-charge in Bihar, where elections will be held in three phases on October 28, November 3 and November 7.
Pandey, an outspoken police officer, joined the party in the presence of Chief Minister Nitish Kumar, who is also the JD(U) president.
Gupteshwar Pandey however, insisted that he had walked down to the state headquarters of the JD(U), headed by thw Chief Minister, to "thank" Kumar for the trust reposed in him by the latter.
The Shiv Sena-NCP-Congress, partners in the MVA government in Maharashtra, have been critical of the former IPS officer over his recent comments and perceived closeness to the BJP.
Gupteshwar Pandey has been replaced as DGP by IPS officer SK Singhal .
The comment from the Bihar DGP came just days after Chakraborty approached the Supreme Court to file an affidavit seeking an end to media trial.
"Now the citizens also do not trust Mumbai Police so let CBI handle the case. What message are they conveying in the entire country?" Gupteshwar Pandey said.
Sushant death case: Bihar DGP warns of legal action if IPS officer not allowed to leave Mumbai today
Pandey expressed bewilderment over no positive response from the municipal authorities in Mumbai, whom he accused of keeping IPS officer Vinay Tiwari in virtual house arrest.
Patna SP is in Mumbai to probe a case related to the death of actor Sushant Singh Rajput. He was quarantined by BMC after he travelled via a flight to Mumbai to investigate the case.
Gupteshwar Pandey has created a pool of around 2 lakh of youths through his "nashamukti" tour before he became the DGP.