The names of boxers Vijender Singh and Ram Singh cropped up after Anoop Singh Kahlon, an NRI, was arrested with 26 kg of heroin in a raid late Thursday.
Kahlon told the police that both the boxers were regular clients.
Police also found a car registered in Vijender's wife Archana's name outside Khalon's house, from where the drugs were recovered.
"This vehicle was used by Ram Singh to drop Vijender at the Chandigarh airport on Wednesday. Now we have to find out how this vehicle reached outside the house of an international drug peddler. Ram Singh has admitted that he knew Kahlon, but said he never bought any drugs from him. We will question him today (Saturday)," said a senior official of Punjab police, who did not wish to be named.
Police sources said that Vijender, who is currently in Mumbai, may also be asked to come to Punjab to join the investigation.
Kahlon, a Canada-based NRI who works as a truck driver, and Kulwinder Singh alias Rockey of Nawanshahar Badala village in Mohali district, were arrested by Fatehgarh Sahib district police from a flat in Zirakpur town. Both the accused are in police remand.
Fatehgarh Sahib is 45 km from Chandigarh.