Floyd Mayweather Jr. offered a critical response Tuesday night to Manny Pacquiao’s mounting complaints about how his injured shoulder affected his performance in their 12-round welterweight title fight Saturday night.

Mayweather posted a picture of himself on his Instagram account late Tuesday night, along with a message. It read: 19 years in the fight game and I’ve had one excuse: “Don’t have an excuse.” Winners win and losers have excuses.

When Pacquiao first revealed the injury in the immediate aftermath of Mayweather’s win Saturday night at MGM Grand in Las Vegas, Mayweather matter-of-factly said during the post-fight press conference that he would’ve handled it differently had he suffered an injury and lost to Pacquiao (57-6-2, 38 KOs).

“I have injuries, also, going into this fight,” Mayweather said Saturday night. “If he would’ve won, I would’ve got up here and the only thing I would’ve said was, ‘I’ve got to show respect and just say he was the better man,’ if he beat me. Both of my arms were injured, both of my hands are injured. But like I said before, I will always find a way to win.”

Since Saturday night, though, Pacquiao and his handlers have gone out of their way to emphasize the role a tear to Pacquiao’s right rotator cuff played in his performance against Mayweather (48-0, 26 KOs), who won by large margins on all three scorecards (118-110, 116-112, 116-112).

Dr. Neal ElAttrache – a noted Los Angeles-based surgeon who has performed procedures on the shoulders of Lakers star Kobe Bryant, Patriots quarterback Tom Brady, former heavyweight champ Vitali Klitschko and ex-welterweight champ Andre Berto – said Monday that Pacquiao would require surgery to repair the tear and that it could cause a break between bouts that could last as long as a year.

Frustrated fight fans, casual consumers and Nevada State Athletic Commission officials have condemned Pacquiao for failing to disclose the supposed seriousness of the injury before the fight. Some critics have gone as far as to accuse Pacquiao of fraud for fighting while he was as injured as the Filipino superstar claims to have been before the fight.