Karmakar, who made it to the Olympics after clearing the National Rifles Association of India selection procedure, had met Ganguly before leaving for the ISSF World Cup in London.
Ganguly had told him that he might drop in to cheer for him in the London Olympics.
"It has been a very short conversation. I'll be happy if Dada comes to see his "younger brother" battle it out in London... Hope if someone of us wins, he does his shirt-swirl act again," Karmakar told PTI in an interview before he left for London for the World Cup.
The World Cup will be held at the Royal Artillery Barracks in Woolwich, the same venue that will host the Olympics and the 32-year-old is confident that India would better their Beijing 2008 performance.
"No one is going to leave any stone unturned for their preparation and, I believe, with the raw talent and inherent ability of marksmanship at their disposal, India with 11 shooters this time around will improve on their Beijing show," said Karmakar.