The Bol Bachchan star attended several events while in London in his capacity as brand ambassador for OMEGA, official sponsors of the Games.
Speaking on Twitter, Bachchan said: 'I'm very proud of each and every Indian Olympian! It's a huge matter of pride and honour for the nation to simply qualify for the Olympics."
The actor went on to say he believes it is important to encourage the participants rather than demoralise them, tweeting: "We should be encouraging our sportsmen/women, not continuously demoralising them with negativity.
"They've made it to the Olympics...that's HUGE! Regardless of whether they win or not, they've already made the nation proud.
"The encouragement and positivity the British team receives from their public and media is amazing and something to learn from."
Copyright: Martin Rickett/PA Wire/Press Association ImagesSpeaking to Digital Spy recently, the actor said he would like to be more involved in promoting sport in India.
"I feel very strongly about how we need to push sports back home in India. I'd love to help in that. Basketball is my favourite sport and I'm also a very passionate football fan," he explained.
"I think if we could channel our energies and get organised, even in track and field we could do very well. Even if it takes several generations, we'll get there."