He stayed in training as a four-year-old but was affected by a virus and subsequent physical setback and was retired after making an unsuccessful return to racing in August 2017.

On 8 October the colt was moved up in class for the Listed Grand Critérium de Bordeaux and started odds-on favourite against five opponents.

[6] Almanzor's final appearance of 2015 saw him stepped up to Group One level for the Critérium International over 1400 metres on very soft ground at Saint-Cloud Racecourse on 1 November.

On his three-year-old debut Almanzor was partnered by Eyquem in the Group Three Prix de Fontainebleau over 1600 metres on 29 April and stayed on to finish third behind Dicton and Taareef, beaten three quarters of a length by the winner.

[7] In the Prix du Jockey Club at Chantilly on 5 June Almanzor was ridden by Eyquem and started a 20/1 outsider in a sixteen-runner field.

The British colt Foundation (winner of the Royal Lodge Stakes) started favourite ahead of the Rouget stable's main hope Mekhtaal (Prix Hocquart) with the other fancied runners including Imperial Aviator, Robin of Navan (Critérium de Saint-Cloud), Zarak (beaten favourite in the Poule d'Essai des Poulains) and Dicton.

He raced towards the rear of the field before making a strong late challenge, taking the lead 70 metres out and winning by a length from Zarak.

[10] On 10 September Almanzor was sent to Ireland and was matched against older horses for the first time when he contested the Irish Champion Stakes over ten furlongs at Leopardstown Racecourse.

Ridden by Soumillon he started 7/1 joint third favourite behind Harzand and Minding in a twelve-runner field which also included Found, New Bay, Highland Reel and Hawkbill.

He started favourite ahead of the Arc winner Found, whilst the other runners included Jack Hobbs, The Grey Gatsby, US Army Ranger and My Dream Boat (Prince of Wales's Stakes).