After spells with English Premier League clubs Leicester City and Watford, Miller joined Dundee United in 2000 where he played for four seasons.

[5] Miller made his senior debut in 1993 aged just 17, and showed he was talented enough to make an impression in the nine-in-a-row team under Walter Smith, winning three Scottish Premier Division titles between 1995 and 1997 (providing the cross for Brian Laudrup to score the championship-clinching goal in the latter),[6] as well as lifting the Scottish League Cup in 1996[7] and starting matches in the UEFA Champions League against the likes of Juventus, Borussia Dortmund and Ajax, all by the age of 21.

[10][4] However, a lifestyle of parties and an unhealthy diet (with both his old Castlemilk pals and others such as teammate Paul Gascoigne's entourage) accompanied this early success, even after he made attempts to start afresh by moving with his partner to Rutherglen where their daughter was born in 1994,[5] and his career appeared to be on the wane.

[12] Having fallen out of favour at Ibrox with the emerging Barry Ferguson being preferred in midfield, Miller was loaned to Leicester City towards the end of the 1998–99 season (having played enough matches for Rangers to receive a fourth league winner's medal) before joining Watford for £450,000 in October 1999.

He had early success with the club in the 2004 Norwegian Football Cup Final, a 4–1 win over Lyn, coming on as a late substitute for Winters who had scored one of the goals.

[18] He played regularly in 2005, although the club finished only mid-table, and in 2006 he started off as one of the league's top players, but gradually received some attention off the pitch, apparently provoked by lack of confidence from the manager.

Miller also criticised Mjelde's unusually close ties to his rival for the attacking central midfield spot, Martin Andresen.

Miller refused to participate in the silver medal ceremony after the game against Ham-Kam on 29 October, following which he was ignored by the coach, and only played the last minute of Brann's Royal League match against Rosenborg on 7 December 2006, in which he contributed to the winning goal scored by Trond Fredrik Ludvigsen.

[20] In early January 2007, Miller began training with Scottish First Division club St Johnstone to top up his fitness during the Norwegian league's winter break.

[23] Miller returned to the first team on 17 January 2009 as a substitute against Sydney FC coming on late in the game, and made the pass that set up Sergio van Dijk's third goal of the match.