The following year he had a brief spell on loan at Celtic due to injuries to both of their first-team goalkeepers Jonathan Gould and Stewart Kerr.
[6] Warner returned to Liverpool, but headed back north to Scotland in March 1999 for a two-week trial with Hibernian.
[10] Warner left Millwall in July 2004 to sign for Cardiff City[13] where he spent two years unable to hold down a first team spot due to some poor performances[14] and eventually lost his place to Neil Alexander.
[15] Warner's career at Fulham started well, he kept a clean sheet on his debut against Birmingham City and in a match against Arsenal at Highbury he saved a penalty from Lauren with the score at 0–0.
Warner joined Championship side Barnsley on loan for a month on January transfer deadline day, as cover for Heinz Muller's injury.
Warner made his debut for Hull in the FA Cup match against Millwall on 24 January 2009, where he kept a clean sheet in a 2–0 victory.
[31] On 25 August 2009, Warner made his season debut and only second competitive start for Hull City in the 3–1 League Cup win over Southend United.
[33] On 25 March 2010, Charlton Athletic announced that Warner would join them for the remainder of the season, after their number 1 choice goalkeeper Robert Elliot was ruled out for a month.
Warner joined Scunthorpe United on 22 October 2010 on a free transfer,[39] and made his debut the following day in the 2–0 win at Watford.
[40] He started his second game in a row which came against former club Leeds United with first choice goalkeeper Joe Murphy still out injured [41] Warner was released on 24 November 2010.
Warner made his debut for the Phoenix against Newcastle Jets in place of the injured regular goalkeeper Mark Paston.
On 26 March 2015, Warner joined his 21st club, signing a playing contract with Accrington Stanley whilst also combining coaching with Bolton Wanderers.
[50] On 2 July 2015, Warner is announced as Goalkeeper/Goalkeeping coach for Indian Super League team North East United FC.
Warner had allegedly applied for the post of Goalkeeping coach at Bolton Wanderers even after inking a deal with North East United FC.
[53] He was also registered as a player, taking the squad number 34 and being named on the substitutes' bench for the first match of the 2018–19 season at home to Gillingham.
Warner made his first appearance as a second-half substitute for the Soca Warriors on 28 February 2006 against Iceland in a friendly international played at Loftus Road.