The Nevada Athletic Commission (NAC) says Pacquiao, 36, did not declare the injury on a pre-fight questionnaire.
But the fighter says he was transparent and a treatment plan had been agreed.
Two people in Nevada have alleged the boxer defrauded ticket buyers, television viewers and gamblers.
They have opened lawsuits just hours after the NAC accused the fighter of being dishonest. If the Filipino is found guilty of that charge, the penalty for perjury could be a jail sentence of between one and four years, and a fine of up to $5,000 (£3,305).
Pacquiao blamed his points defeat on the injury - claiming it stopped him using his right hand - but a joint statement released by Team Pacquiao and his promoters Top Rank said the United States Anti-Doping Agency (Usada) had been notified during the fighter's training camp and on fight night.
They added that a Usada doctor sanctioned the use of a non-steroidal anti-inflammatory on fight night, but the NAC did not allow it to be administered because they were "unaware" of the shoulder injury.
The statement added: "This was disappointing since Team Pacquiao had disclosed the injury and treatment to Usada, who approved the treatments and Manny had listed the medication on his pre-fight medical form."
The NAC says the Pacquiao camp were not "obligated" to disclose the injury, but their executive director Bob Bennett said: "It's not just the fact he didn't fill out the question completely, it's that he wasn't honest.
"Two hours before the fight they wanted a shot that's a painkiller, in essence. That put us in a very precarious position."
The form Pacquiao signed asked if he had "any injuries to his shoulders, elbows, or hands that needed evaluation or examination".
The legal disclaimer states that the signatory "swears, under penalty of perjury, that the above information is true and correct".
Surgeon Neal ElAttrache told ESPN the fighter has a "significant tear" in his rotator cuff and added the injury was likely to sideline him for between nine and 12 months.
Mayweather, 38, scored a unanimous points-victory in the four-belt unification bout at the MGM Grand Garden Arena, the win extending the American's unbeaten record as a professional to 48 fights.
Pacquiao's surgery means any rematch is unlikely, with Mayweather insisting he will retire in September after one more fight.
Sarfraz Ali is working as Editor Web for Daily Pakistan. He earned a postgraduate degree in Mass Communication from IUB and diploma in International Print Journalism from Thomson Foundation UK. He regularly writes on ...
KARACHI - Following are the foreign currency exchange rates for US Dollar, Saudi Riyal, UK Pound Sterling, U.A.E. Dirham, European Euro, and other foreign currencies in Pakistan open market on February 1, 2023 (Wednesday).
Source: Forex Association of Pakistan. (last update 09:00 AM)
|UK Pound Sterling||GBP||330.48||331.18|
|Hong Kong Dollar||HKD||33.72||34.07|
|New Zealand Dollar||NZD||171.35||173.35|
KARACHI – The price of a single tola of 24-karat gold in Pakistan is Rs202,000 on Wednesday. The price of 10 grams of 24k gold was recorded at Rs173,190.
Likewise, 10 grams of 22k gold were being traded for Rs164,500 while a single tola of 22-karat gold was being sold at Rs 179,100.
Note: The gold rate in Pakistan is fluctuating according to the international market so the price is never been fixed. The below rates are provided by local gold markets and Sarafa Markets of different cities.
|Lahore||PKR 202,000||PKR 2,390|
|Karachi||PKR 202,000||PKR 2,390|
|Islamabad||PKR 202,000||PKR 2,390|
|Peshawar||PKR 202,000||PKR 2,390|
|Quetta||PKR 202,000||PKR 2,390|
|Sialkot||PKR 202,000||PKR 2,390|
|Attock||PKR 202,000||PKR 2,390|
|Gujranwala||PKR 202,000||PKR 2,390|
|Jehlum||PKR 202,000||PKR 2,390|
|Multan||PKR 202,000||PKR 2,390|
|Bahawalpur||PKR 202,000||PKR 2,390|
|Gujrat||PKR 202,000||PKR 2,390|
|Nawabshah||PKR 202,000||PKR 2,390|
|Chakwal||PKR 202,000||PKR 2,390|
|Hyderabad||PKR 202,000||PKR 2,390|
|Nowshehra||PKR 202,000||PKR 2,390|
|Sargodha||PKR 202,000||PKR 2,390|
|Faisalabad||PKR 202,000||PKR 2,390|
|Mirpur||PKR 202,000||PKR 2,390|