Three-time boxing world champion Hector "Macho" Camacho could be left paralysed after he was shot in the face while sitting in a car.
The fighter's last title bout came against then-welterweight champion Oscar De La Hoya in 1997, when he lost on a unanimous decision after winning super lightweight, lightweight and junior welterweight world titles in the 1980s.
Camacho, 50, was rushed to San Juan's Centro Medico trauma centre in Mexico after the shooting, where he was in critical but stable condition.
Camacho's spokesman Steve Tannenbaum said: "This guy is a cat with nine lives. He's been through so much - if anybody can pull through, it will be him."
Tannenbaum claimed Mexican Camacho was going to fight two years ago in Denmark until his opponent pulled out - but they were still looking at a possible bout in 2013.
"We were talking comeback even though he is 50 - I felt he was capable of it," he added.
In his prime Camacho fought high-profile championship bouts against Felix Trinidad, Julio Cesar Chavez and Sugar Ray Leonard, whose career he ended with a 1997 knockout.
Camacho had a career record of 79-5-3, with his most recent fight coming in 2009.
He has battled drug, alcohol and other problems since and was sentenced in 2007 to seven years in prison for the burglary of a computer store in Mississippi.
However, a judge eventually suspended all but one year of the sentence and gave Camacho probation. He served only two weeks in jail.