 In autumn, Relko returned to the racecourse to record an impressive win in the Prix Royal Oak on 15 September, easily defeating Sanctus, the winner of the Prix du Jockey Club and the Grand Prix de Paris.In the Prix de l'Arc de Triomphe, Relko became highly agitated before the start and ran poorly, finishing sixth behind Exbury.Relko was unbeaten in three starts as a four-year-old.