Indian wrestler Yogeshwar Dutt's bronze medal from the London Olympics may be upgraded to silver amid reports that the silver medallist from the 2012 Games deceased Besik Kudukhov of Russia has been stripped off his medal for using banned substance.As per Russian agency, flowrestling.org, the four-time world champion and two-time Olympic medallist Kudukhov, who died in a car crash in 2013 in southern Russia, has been found positive for dope test conducted by the World Anti-Doping Agency.As a result, Yogeshwar Dutt, who had bagged a bronze medal inmen's 60kg freestyle category in London Games, may move up from bronze to silver and join Sushil Kumar as another silver medallist from the 2012 Olympics. However, the official confirmation will have to come from the United World Wrestling (UWW) and the International Olympic Committee.