Yelich entered Sunday with 31 home runs through 82 games this season.
Athletics third baseman Matt Chapman will replace Brewers outfielder Christian Yelich in the 2019 Home Run Derby, MLB announced Sunday.
Yelich, the reigning league MVP, is currently dealing with a back injury. The ailment forced Yelich to miss Milwaukee's game against the Pirates.
Yelich expressed his disappointment on Twitter and apologized to fans for not being able to participate in the derby. The 27-year-old told reporters that he still wants to start the All-Star Game Tuesday night if his back was feeling better, which was approved by Brewers manager Craig Counsel.
Extremely disappointed to not be able to participate in the HR Derby tomorrow. Always been a dream but unfortunately things don’t always go your way and I’m not physically able. I’m sorry if anybody was let down but I hope to be apart of it again at some point in the future.— Christian Yelich (@ChristianYelich) July 7, 2019
Yelich has hit a league-leading 31 home runs through 82 games this season. He was slated to be the derby's No. 1 seed and face eighth-seeded Toronto's Vladimir Guerrero Jr. in the first round.
Chapman entered Sunday with 21 homers through 89 games. He was named to his first All-Star Game this year.