Pat Zaranek, a spokesman for Donaghy, said Thursday that the former referee, serving a 15-month sentence in a gambling scandal, was struck in the right knee with a stick or other hard object in November.
Zaranek, of Executive Prison Consultants, says Donaghy expects to be transferred from the camp in Pensacola to a halfway house in Tampa next week.
Zaranek says Donaghy's knee still gives him trouble and that he will need surgery.
A Federal Bureau of Prisons spokeswoman declined comment.
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Major League Baseball umpires made a special visit to treat some local kids to much-needed smiles on Wednesday. They brought a Build-A-Bear workshop to patients at Rady Children's Hospital.