Connections have confirmed Masar will not race again this season because of a leg injury.
The Godolphin-owned colt was last season when winning the Epsom Derby at the start of June but a setback before the Coral-Eclipse at Sandown has brought his season to an early end.
“After discussions with [Godoplhin founder] His Highness Sheikh Mohammed he was keen to see him stay in training, so we felt to give him the best chance next year we would give him the rest of this season off,” said trainer Charlie Appleby, as reported by the Yorkshire Post.
“He?s going to miss eight weeks now anyway and you can?t get a lead into championship race, like the Prix de l?Arc de Triomphe [at Longchamp in October], by missing this much time.
“He’s a substantial colt anyway, there’s a chance there?s more to come and going into his four-year-old season he takes the best mile-and-a-half form.”