Congratulating Sushil, Milkha Singh said that he had fought well and deserved to win a gold, though he was unlucky not to get it in the end.
"I was catching the action on TV. I was also following the news on news channels and could see Sushil's mother praying. He has made everyone proud," the 82-year-old said.
"Sushil Kumar came quite close to winning gold, but it doesnt matter. He fought really hard," he added.
Singh also congratulated grappler Yogeshwar Dutt for winning a bronze and said he was happy that Indian won six medals this time.
Milkha Singh's son and ace golfer Jeev Milkha Singh, who is playing abroad currently, also congratulated Sushil Kumar and other medal winners for doing the nation proud with their performance.
Milkha said India should not rest on the six medals won by the athletes and immediately should start preparing for the next Olympics.
"I will first like to congratulate Sports Minister Ajay Maken and then suggest him that we should put our preparations on track right from today," he said.
"We should hire coaches on contract basis and continue with them depending on the results they produce," he added.