Midfielder David Fox became Paul Lambert's fourth signing of the 2010 pre-season when he signed for Norwich from Colchester on 4th June 2010 for an undisclosed fee. he signed a two year contract.

The son of former professional Peter Fox, David came through the youth ranks at Exeter City before swapping St James's Park for Old Trafford shortly after the departure of his father Peter as Grecians boss nine years ago.

Fox signed a professional contract with Manchester United on 13th December 2000 (his 17th birthday). After loan spells in 2002-03 and 2003-04 with Royal Antwerp (Man Utd's feeder side in belgium), he was loaned to League Two side Shrewsbury Town in October 2004. He made his professional debut in a 1–0 home defeat to Rushden & Diamonds, then scored a goal in his second game, a 4-1 defeat at Leyton Orient.

After captaining Man Utd's reserve side and winning England Under-20 caps, he signed for Blackpool on a free transfer in January 2006. He scored his first goal for the Seasiders on 4th February 2006, in a 2-2 draw against Nottingham Forest at Bloomfield Road. On 9thJune 2009, Fox was one of eight Blackpool players released by new manager Ian Holloway. He joined Colchester United on 1st July 2009

Fox made his league debut for Colchester on 8th August, 2009, in their 7–1 away victory over Norwich City, in which he scored a fine free-kick. He made 18 appearances for Colchester, scoring three times, but fell out of favour with manager Aidy Boothroyd.

David made his City debut in the 3-2 home defeat to Watford on 6th August 2010

Norwich won promotion to the Premiership, on 2nd May 2011 with a 1-0 win at Portsmouth with Fox providing the pass to Simeon Jackson for the only goal of the game.

The following season, David made 32 appearances as Norwich finished 12th in the Premier League

On 11th September 2012, David signed a new year two contract which will keep him at Carrow Road until 2014.

On 26th September 2013, David joined Barnsley on a three month loan, following England Under-21 international keeper Jack Butland to Oakwell. He made his debut the following day against Leicester.

David returned to Norwich in January 2014 playing in the FA Cup third round clash with Fulham that finished 1-1. He had made 7 appearances for Barnsley. He made just one more appearance in the 2013/14 season and was released at the end of it.

Fox joined Rochdale on trial at the end of July 2014 playing in friendlies at Macclesfield and Bury. On 6th October 2014, Fox signed a three month deal with former club Colchester with whom he had been training. "David adds experience to a young squad. He fits our profile of how we want to play the game and will be a good addition to the squad for the coming months." said Colchester manager Tony Hume

Fox stayed to the end of the 2014/15 season making 33 appearances. Although Colchester wanted to offer a new deal, Fox wanted to move back to his native North West and joined Crewe on trial at the end of June 2015. He signed a one year deal with Crewe on 14th July 2015.

Crewe and Fox were relegated to League Two on April 9th 2016. He was released by Crewe on 11th May 2016. He had played 41 games for Crewe in 2015/16, scoring twice. He was quickly linked with a return to Exeter but instead signed for Plymouth on 22nd July 2016. He had featured in three of Argyle's pre-season friendlies this summer. He was their 13th signing of the summer.

Fox and Plymouth won promotion to League One on 17th April with manager Derek Adams attributing the club's success to the new players brought in over the summer. Fox had played 47 games, scoring once.

Fox and Plymouth were relegated to League One on 4th May 2019. Out of contract, Fox left Plymouth and trialled with non-league Barrow in July 2019, entering into contract negotiations even after playing in a 3-0 defeat to Blackpool. He later joined his brother Mark at Leek County School Old Boys in the Staffordshire County Senior League.

In 2020 he joined Huddersfield in June 2020 as Loan Manager / Academy Recruitment lead.