In a post on Instagram, he said: I want to apologise for my behaviour last weekend - for not being more careful and candid in how I described the events of that early morning and for my role in taking the focus away from the many athletes fulfilling their dreams of participating in the Olympics."
It comes hours after American Olympic authorities have sought to draw a line under the "Rio robbery" controversy - issuing an apology to Brazil and arranging for one of the swimmers involved to make a $10,800 payment by means of reparations.
American officials have also said the men’s behaviour was not acceptable.
“The behaviour of these athletes is not acceptable, nor does it represent the values of Team USA or the conduct of the vast majority of its members,” Scott Blackman, CEO of the United States Olympic Committee, said in a statement.
“We will further review the matter, and any potential consequences for the athletes, when we return to the United States. On behalf of the United States Olympic Committee, we apologise to our hosts in Rio and the people of Brazil for this distracting ordeal in the midst of what should rightly be a celebration of excellence.”