Coolmore has announced that St Nicholas Abbey has suffered a "major complication" in his recovery from a fractured leg.
Radiographs showed the steel weight-bearing pin in his cannon bone had broken and he underwent surgery to have it removed.
The leg has been re-cast and St Nicholas Abbey is now bearing weight on the fractured leg.
The stud also tweeted that the horse was “comfortable” and “walking as well as can be expected”.
The horse suffered a career-ending fractured pastern injury in July.
His temperament and demeanour are a tremendous plus both for him and the team treating him.— Coolmore (@coolmorestud) August 28, 2013