Hall of Fame second baseman Ryne Sandberg announced Monday that he’s battling prostate cancer.

In a post on his Instagram page, the former Chicago Cubs great shared that he learned last week of his metastatic prostate cancer diagnosis, adding that he already has begun treatment.

“We will continue to be positive, strong and fight to beat this,” Sandberg wrote in his post. “Please keep us in your thoughts and prayers during this difficult time for me and my family.”

A bronze statue of Sandberg, 64, will be unveiled in Gallagher Way outside Wrigley Field on June 23, coinciding with the 40th anniversary of his legendary “Sandberg Game” against the St. Louis Cardinals.

The Wrigleyville company Obvious Shirts is planning to create a T-shirt in honor of Sandberg’s cancer fight with 100% of sales donated to a charity of Sandberg’s choice, which is still being finalized.

A winner of nine Gold Glove and seven Silver Slugger awards as well as the 1984 National League MVP award, Sandberg was inducted into the Baseball Hall of Fame in 2005 and had his No. 23 retired by the Cubs the same year.

He spent four seasons (2007-10) managing in the Cubs farm system before departing the organization and joining the Philadelphia Phillies, who drafted him in the 20th round in 1978, to manage their Triple-A affiliate in 2011. After a promotion to the big-league coaching staff in 2012, Sandberg took over as the Phillies interim manager in August 2013 and one month later had the interim title removed.

Sandberg returned to the Cubs in an ambassador role in 2016 after he resigned as Phillies manager in June 2015.

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