None of the club staff believed it was too bad but the assessments have revealed he has suffered a leg fracture, according to The Times.
Palace boss Alan Pardew is now planning to take on Manchester United in the FA Cup final without Ledley in his ranks.
Chris Coleman, meanwhile, is left facing a Wales rejig.
He had named Ledley in Wales’ 29-man provisional squad for a training camp in Portugal later this month.
The Palace ace was seem as the first-choice to partner Joe Allen in midfield – but now he will miss out altogether.