Jon Hamm has revealed how his latest film has inspired him to support Indian baseball player Rinku Singh's application for American citizenship.

The Mad Men star plays sports agent JB Bernstein in the biographical sports drama, who introduces two Indian cricket players - Rinku (played by Life Of Pi's Suraj Sharma) and Dinesh Patel (Slumdog Millionaire's Madhur Mittal) - to the world of American baseball.

"I've seen Rinku. In fact, I've written a letter sponsoring his citizenship to the States," Jon said.

"I do follow his story and I do wish him the best. He's been injured - he injured his elbow pitching - so hopefully he will come back stronger from that injury and make the Majors. That would be a wonderful coda."

Jon said the film, which follows the two athletes through their journey until they are offered contracts by the Pittsburgh Pirates, is truly inspirational.

The movie also focuses on JB's pitching contest, the Million Dollar Arm, which aims to find more budding Indian athletes.

"It's a story that works on a lot of levels. It's a sports film but it's a movie about family, hard work, dedication, setting goals and achieving them. So in many ways, it's a very inspirational film," the actor explained.

"It's a true story. What these kids did is almost impossible and yet they achieved it. That's an inspiring message to get out, especially to young people. I look at JB's journey. This wasn't a one-and-done thing. He's invested himself in India and he's done this eight years in a row now, and the competition has gotten bigger and bigger and more successful.

"It's inspiring to see a man take this bold choice in his life and continue down that path," the 43-year-old added.

:: Million Dollar Arm is in cinemas now.