Carlos Delfino has been told that he will require a second surgery on his foot and that the latest setback could force him to miss the rest of the season.
However, a consultation with specialists in North Carolina confirmed that a second operation was needed and that he could be out for another six months.
"I'm frustrated because I did all the recovery work but my body did not respond as expected," Delfino revealed in a statement released on his website. "I'm still optimistic.
"Now I have to be calm and open to the decision of the professional who can help me in the recovery of my injury. This is worse than I expected but I am sure that I will return to the court."
The Bucks signed Delfino to a two-year deal in the summer despite his battle with the injury.