The UFC champion will appear alongside veteran actors in a remake of the 1980s cult classic starring Patrick Swayze.
The former UFC champ thanked his pooch "for all the work put in alongside me to get this life correct for our family."
"Folks I’m calling this as the worst first pitch in history," one Twitter user jabbed at the UFC star's botched delivery at Wrigley Field.
The UFC star later called the singer a "little Vanilla Ice boy rapper" and denied anything had happened.
McGregor was unable to continue after the first round, and will undergo surgery on Sunday.
A report in The New York Times claims that the UFC star sexually assaulted a woman in Ireland.
"It's a little early for April Fools," ESPN's Jorge Sedano quipped.
He was charged with robbery and criminal mischief.
FYI, Jackie Chan is Chinese, not Japanese.
The UFC star "went bananas" and shattered a window, injuring other fighters.