Boston Red Sox manager John Farrell will go on medical leave for the rest of the season after being diagnosed with stage-one lymphoma.

John Farrell, who led the team to a World Series win in 2013, said his cancer of the immune system is “very treatable”.

Red Sox assistant coach Torey Lovullo will serve as manager while John Farrell receives treatment.

Photo Getty Images

Doctors discovered the cancer when John Farrell was undergoing hernia surgery earlier this week.

“I can honestly tell you that I’m extremely fortunate that it was found,” John Farrell said on August 14.

“It’s localized. It’s highly curable.”

John Farrell started his career as a Major League Baseball pitcher and also served as the manager of the Toronto Blue Jays from 2011 to 2012.

After breaking the news, John Farrell received an outpouring of support from fans and colleagues on social media.

Even the Red Sox’s arch-rivals, the New York Yankees tweeted: “Wishing RedSox manager John Farrell a full and speedy recovery.”