The BJP Saturday said the party will take "cognisance" of its MP Shatrughan Sinha's presence at the united opposition rally against the Narendra Modi government and termed the actor-turned-politician an "opportunist."

Sinha, a former Union minister and a disgruntled BJP MP from Patna, attended the rally in Kolkata organised by TMC supremo and West Bengal Chief Minister Mamata Banerjee where he reportedly spoke against Modi and the BJP-led government at the Centre.

Addressing a press conference at the party office here, BJP's national spokesperson Rajiv Pratap Rudy described Sinha as an "opportunist" and said he was in the party to enjoy the perks of being an MP, but at the same time seen making different voices at various platforms.

"Sinha has been speaking against the party at various platforms. And it is always important for the BJP to act against such people and the party will take cognisance of it," Rudy said.

Taking a dig at Sinha, Rudy said some people are "intelligent in different ways". They abide by the party's whip so that they don't lose their membership.

"At the same time, they are so opportunistic... and can be present at any conclave. The BJP will take cognisance of it," Rudy said.

Sinha has been regularly speaking against the BJP's top leadership which provoked Bihar's Deputy Chief Minister Sushil Kumar Modi earlier this week, who suggested that Sinha should quit the party.