But they have already lost seamer Tim Linley with a damaged right foot, while South African fast bowler Nel and spinner Gareth Batty are carrying injuries.
"Duncan has suffered a few complications with his recovery and the damaged bone in his foot failed to unite during the period he was in plaster, " said Ospreys physio Chris Towers.
Tens of thousands of boats in the 20- to 60-foot range were, like the Guy-Mar, damaged by Charley, Frances, Ivan or Jeanne, the four hurricanes that landed in Florida between August and September.