New York Yankees manager Aaron Boone has taken a medical leave of absence following surgery to receive a pacemaker, the MLB franchise announced.
Boone, who underwent open-heart surgery in 2009, is recovering at St. Joseph's Hospital in Tampa, Florida after Wednesday's operation.
The Yankees said the procedure was "expected", while general manager Brian Cashman added Boone could return to the team within two to three days.
"As many of you know, I underwent open-heart surgery in 2009, and I wanted everyone to understand where I'm at regarding the procedure that's taking place today," Boone said. "Over the last six-eight weeks I've had mild symptoms of light-headedness, low energy and shortness of breath.
"As a result, I underwent a series of tests and examinations in New York prior to the beginning of Spring Training, including multiple visits with a team of heart specialists. While the heart check-up came back normal, there were indications of a low heart rate which, after further consultations with doctors in Tampa, necessitates a pacemaker.
"My faith is strong, and my spirits are high. I'm in a great frame of mind because I know I'm in good hands with the doctors and medical staff here at St. Joseph's Hospital. They are confident that today's surgery will allow me to resume all of my usual professional and personal activities and afford me a positive long-term health prognosis without having to change anything about my way of life.
"I look forward to getting back to work in the next several days, but during my short-term absence, I have complete trust that our coaches, staff and players will continue their training and preparation at the same level as we've had and without any interruption.
"I also want to take this opportunity to remind all those dealing with heart issues to remain vigilant in your care and to reach out to your doctor should you have any symptoms of discomfort or trouble.
"Any issue involving the heart has the potential to be serious. Staying on top of your health is always the first and most important thing you can do for yourself and your family."
Boone has been Yankees manager since 2018, leading the storied franchise to the American League Championship Series (ALCS) in 2019, while they lost in the AL Division Series (ALDS) last year.
The 47-year-old was an All-Star with the Yankees in 2003.
"It's a necessary step,'' Cashman said of Boone's surgery. "It's something that's not avoidable and needs to be taken care of, but he has no fear and I know he's just in great hands and it's just a temporary timeout. He looks forward to getting back to doing what he does best and doing what he loves, which is baseball.'
"When you hear 'pacemaker,' it kind of sets off a lot of alarms of concern... No one's going to do more research than the person that's going to be going through this, and I felt so comforted by the way he communicated with me on it that he put me at ease."
Yankees managing general partner Hal Steinbrenner added: "The thoughts of the entire organisation are with Aaron and his family as he undergoes this procedure and takes the time he needs to properly heal.
"Aaron leads our players, coaches and staff with a rare combination of work ethic, intelligence and a genuine concern for others. Our only priority at this time is Aaron's health and well-being, and we will support him in every way throughout his recovery."