Fox began his career at Celtic. However, he never made an appearance for the club. During his time at Celtic, he was part of the side that won the double of under-19 league and the Scottish Youth Cup in 2005 and 2006. On 20 August 2007, he signed for the Third Division club East Fife on loan. While he was at East Fife, he won the Scottish Football League Young Player of the Month Award for November 2007. On 15 January 2008, he agreed to move to Ayr United on loan for the rest of the season. However, Celtic cancelled the loan and the transfer never took place. With his contract at Celtic having expired in Summer 2009, Fox went on trial at Exeter City and Lincoln City. However, due to Celtic being entitled to a development fee and still holding his registration as he was under 23, there was no contract offer. Fox eventually took his case to FIFA although he ultimately lost and spent six months without playing.
Queen of the South
Manager Gordon Chisholm signed Fox on 29 January 2010, for Dumfries club Queen of the South from Celtic on amateur forms. Chisholm gave Fox his debut on 16 February 2010 in place of the suspended David Hutton. Fox debuted with a clean sheet to his name in a 3–0 win for Queens at Palmerston Park against Ayr United. His next appearance came under the management of Kenny Brannigan on 3 April 2010, when he came on as a substitute in the 36th minute when Hutton injured his back away to Morton at Cappielow. The game ended in a 3–3 draw. Fox played in 6 league matches for Queen of the South. He was not on the Queens retained list at the end of the 2009–10 season.
Dundee
Fox joined up for the second time with manager Gordon Chisholm at the start of July 2010 when he joined Dundee. He was released in October when the club entered administration.
Partick Thistle
Fox was on trial for Partick Thistle during a 4–0 reserve team victory against Ayr United. He made his first team debut as a trialist on 30 October 2010, in a 1–0 victory for Partick Thistle against Cowdenbeath. At the end of the 2010–11 season, Fox received the Player of the Year award from the club. In April 2013, Fox signed a new contract keeping him at Partick Thistle until 2015. At the end of the 2012–13 season, with Partick Thistle having won the First Division, gaining promotion to the Scottish Premier League, Fox was named in the PFA Scotland 2012–13 First Division Team of the Year. Following a bad ankle injury in late 2013, Fox was replaced by substitute keeper and ex-Scotland international Paul Gallacher for the remainder of the 2013–14 Scottish Premiership season. Fox made an appearance on the final day of the season in a 3–2 loss to Ross County at Firhill, however, he collided heavily with County's Jordan Slew and was stretchered off with ankle trauma. On 16 August 2014, Fox was sent off against Dundee in the second game of Thistle's 2014–15 Scottish Premiership campaign following an incident with Paul McGowan. He was replaced by Paul Gallacher, who saved the subsequent Gary Harkins penalty. In November 2014, Fox called off the day before Thistle were due to play Aberdeen due to apparent food poisoning. Gallacher subsequently took his place in goals, however, Thistle went on to lose the match 1–0. Fox left the club in May 2015, having made 135 appearances in total for Thistle.
Ross County
On 29 May 2015, Fox made the switch to Scottish Premiership rivals Ross County, signing a two-year deal. During his time at the club, Fox helped County win the Scottish League Cup, though he missed the final due to injury. Fox also won the Scottish Championship and the Scottish Challenge Cup. Fox left County in May 2019 having not agreed a new contract with the club.
Return to Partick Thistle
Fox signed a two-year contract with Partick Thistle on 1 July 2019. Fox made his first appearance in his second spell at Thistle in a 2–2 draw with Hamilton Academical on 20 July 2019. He started the league season as backup goalkeeper to Jamie Sneddon, however, he soon became the club's permanent No.1 goalkeeper from the arrival of new manager Ian McCall. Following Partick Thistle’s early relegation to the Scottish League One as a result of the Coronavirus Pandemic, Fox invoked a relegation release clause on 6 June 2020, ending his second spell at the club.
On 22 June 2020, Fox signed a one year deal with Scottish Premiership outfit Motherwell FC on a free transfer. WE’RE ALL GOING ON A EUROPEAN TOUR, A EUROPEAN TOUR, A EUROPEAN TOUR.
