[2] Hay played for Waitakere City in 1994 and was named in the starting line up as an injury replacement for Rodger Gray in the Chatham Cup final against Wellington Olympic which was won 1–0.
[3] Hay was also a member of the successful Waitakere City team that ended up winning the 1995 New Zealand Superclub League competition beating Waikato United 4–0 in the final.
Hay scored a goal in their 4–1 win over eventual season championship winners South Melbourne at Perth Oval on 7 December 1997.
[13] On 30 September 1999, Hay was named on the bench for Leeds' second leg UEFA Cup first round fixture against Partizan Belgrade at Elland Road.
[14] On 13 September 2000, Hay was named on the bench for their UEFA Champions League first group stage fixture against Barcelona at the Nou Camp.
[16] After making an appearance in the game against Barcelona, Hay was named on the bench but didn't see the field again for Leeds in games against AC Milan,[17] Beşiktaş twice[18][19] and the home fixture against Barcelona[20] On 8 November 2000, Hay was again a substitute for the return leg away fixture against AC Milan which was drawn 1–1.
[23][24] On 30 September 2000, Hay made his first appearance when he came on as a 45th-minute substitute for Lucas Radebe in Leeds United's 4–3 win over Tottenham Hotspur at Elland Road.
[31] On 31 October 2000, Hay started for Leeds in their third round fixture in the Worthington Cup against Tranmere Rovers at Prenton Park which was lost 2–3 after extra time.
[36][37] Hay still had injury worries later in the season precluding him from Leeds' first leg third round UEFA Cup away fixture against Grasshoppers on 22 November 2001.
[13] Hay was released at the end of his Leeds United contract in May 2002[13] and later signed for Walsall[39] in July 2002 who were playing Football League First Division in England.
[41] Hay joined the squad in the early part of 2004[42] making seven appearances and played his last match against Brisbane on 29 February 2004 where he scored a goal.
[43] Hay started the 2005–2006 season as inaugural captain for the Auckland-based New Zealand Knights, but left the club in December 2005, following a falling out with management.
[citation needed] On 22 June 2003, Hay played in the team's final fixture against a French side at Saint-Denis which the New Zealanders lost 0–5.
[citation needed] At the start of 2009, Hay retired from international football to pursue a teaching career at Sacred Heart College in Auckland.
[46] Hay lead Sacred Heart to win the Lotto Premier National Secondary Schools Championship for the years 2011,[53] 2014[54] and 2016.
[52] He was manager of the U17s at the 2015 FIFA U-17 World Cup where they lost to Brazil in the round of 16 due to a 96th-minute penalty[61] having qualified from the group in second-place behind France.
[66][52] They went through the tournament undefeated, finishing top of their group while scoring 27 goals and only conceding one in the semi-final win over Papua New Guinea.