[1] Having played as a youth player for Hurricanes and been cut from the national under-20 team, Hayes sought opportunities in France, where clubs had become wealthy.
[2] On 21 December 2017, with the club now in Pro D2 following relegation from the Top 14, he scored his first try in a 28–23 home win over Bayonne,[3] adding another on 9 March in a 23–16 loss at Colmiers,[4] as his team won promotion as runners-up.
[8] In December 2021, having spent the first half of the season without a club, Hayes signed for Valence Romans Drôme in the third-tier Championnat Fédéral Nationale.
[9] After helping the club to promotion as champions in 2022–23, he retired due to injury in February 2024, having played only five times in his final campaign.
[10] In March 2017, Grenoble teammates Denis Coulson, Rory Grice and Loick Jammes gang-raped a woman after a match in the city of Bordeaux.