"We tried a couple of things but it was just irreversible damage at that point," Appel said.
Kidney transplant gives ex-NFLer a 2nd chance →
"You always want to make sure you can maximally protect the transplant, but I think we'll be able to figure out a way," Appel said. "If he puts his mind to it, he'll be able to do it. Determination is the big thing."