Injured boxer Teresa Perozzi will make a last minute decision on whether she is healthy enough to face Christina Hammer in tonight's middleweight title fight in Germany.

Perozzi sustained a rib injury in her final sparring session in Albouy, New York, and was taken to hospital last Sunday – less than a week before her showdown with Hammer.

Doctors have told the 36-year-old her injury will take three to six weeks to heal.

"I had an unfortunate injury to my back ribs on Sunday during my very last sparring (session)," said Perozzi yesterday. "It was so bad I went to hospital when I returned home that night to Bermuda but fortunately nothing was broken.

"It's just badly strained. It has improved quite a bit but I feel will be a big problem for a ten round fight still. I'm told it will take three to six weeks to heal. I don't want to pull out of fight as have trained so hard ... I will decide tomorrow what I'm going to do."

Perozzi has considered having a pain-numbing injection to get her through the fight but fears it would be considered illegal by the doping commission.

"I will be stripped of belt if I win and it tests positive. I spoke to a medical doctor and he is going to check with the doping commission regarding having an injection," she said.

"I'm pretty sure it's not going to be allowed as it's considered performance enhancing even though it's just to get me through.

"My main concern is just go in there and beat this girl up the way I trained for. I need to be 100 percent."

Perozzi weighted in two pounds under her limit yesterday ahead of tonight's fight for the vacant WBO Championship title.

It would be her second bout in three months having ended her two-year hiatus with a points win over American slugger Cimberley Harris at Berkeley Gym in July.

At just 20 years of age, Hammer is one of the glamour figures of women's boxing and is undefeated after seven fights.