It is understood that Tuigamala insisted on Berridge undergoing two examinations of the injury, which was sustained during a sparring session last week.
While there is no disputing the injury - described as a severe swelling of a knuckle - there is speculation that light-heavyweight Berridge could have boxed through the pain barrier and has withdrawn as he is about to be offered a world title fight by the WBO.
Berridge, nicknamed the "Butcher" and ranked No10 on that organisation's pecking order, is said to be close to a fight against Sergey Kovalev, the WBO's No1-ranked fighter. Kovalev, a 31-year-old Russian with a 24-win, one-draw and no-loss record, is said to be a fighter of the highest quality.
David Higgins of Duco, Berridge's promoters, said he could not comment on the speculation.
"Fights are offered all the time, fights fall through all the time, discussions about who Robert is fighting in the future are ongoing," Higgins said. "They certainly aren't relevant to why Robert is not fighting on the Inga card, which is purely because he is not fit to fight."