Barry Hearn has undergone surgery after suffering a minor heart attack over the weekend.
The 71-year-old sports promoter is chairman of Matchroom, World Snooker and the Professional Darts Corporation.
Boxing promoter son Eddie Hearn, who represents Katie Taylor, confirmed that his father is returning home on Wednesday following a heart attack on Sunday.
"As if we can't thank the NHS enough, I want to particularly thank the staff at Broomfield & Basildon," he posted on Twitter.
"My dad was taken to hospital on Sunday after a minor heart attack and was operated on yesterday.
"He is up and well and returns home today in good spirits!Thank you".