Mattock is a graduate of the Leicester City youth academy, making his senior debut for the club in 2007. He made 73 appearances in total for Leicester before moving to West Bromwich Albion in 2009. Mattock subsequently had spells on loan with Sheffield United, Portsmouth and Brighton & Hove Albion. After leaving West Brom permanently in 2012, he signed for Sheffield Wednesday. Mattock spent three seasons with Sheffield Wednesday before moving to fellow South Yorkshire side Rotherham United. Whilst with Rotherham, Mattock was promoted on three occasions, as well as winning the EFL Trophy. After seven seasons with Rotherham, he signed for Harrogate Town in 2022. He also had a brief loan spell with Hartlepool United. Mattock signed for Marine in August 2024.
Mattock has also represented England youth teams at nearly every level.
On 9 November 2007, during the 2007–08 season, Mattock signed a new three-year contract with Leicester.[3] The club rejected a bid from an unnamed Premier League club for Mattock on 14 January 2008[4] (later revealed to be West Ham United).[5] Following Leicester's relegation in the 2007–08 season, Aston Villa became interested in Mattock and then-teammate Richard Stearman.[5] While Stearman left for Wolves in the July transfer window, Mattock remained at the club for another year.[6] He did, however, hand in a transfer request during pre-season, but was unable to secure a deal with any club.[7]
Mattock suffered ligament damage to his left ankle in a 1–0 League Cup win over Stockport County on 12 August 2008. Fortunately, there was no fracture, meaning he would be out for several weeks instead of months.[8] On 28 August, three days before the close of the transfer window, Leicester rejected seven-figure offers from two unnamed clubs for Mattock.[9] He scored his first and only goal for Leicester in a 2–0 win over Yeovil Town on 19 January 2009.[10] Leicester went on to regain promotion to the Championship by finishing the season as league champions.[11]
West Bromwich Albion
On 6 August, while away on international duty, Mattock was ecstatic when informed by his agent that West Bromwich Albion were interested in him. Eager to leave Leicester, he submitted his transfer request to chairman Milan Mandarić. The manner in which Mattock made the request infuriated manager Nigel Pearson.[7] He signed a three-year contract with West Brom four days later for a fee of £1 million, citing Richard Stearman as his motivation for leaving Leicester.[12] The comment angered many Leicester fans and he was booed upon his return to the Walkers Stadium in November.[13]
Mattock made his debut for Albion in the 2–0 League Cup win over Bury.[14]
In January 2011, he joined Sheffield United on loan until end of the 2010–11 Football League Championship season[15] making his first start for the Blades away at Coventry City a couple of days later. He went on to make 13 appearances for the Yorkshire club but was unable to help prevent them from being relegated at the end of the season. In November of the same year, Mattock joined Championship team Portsmouth on a loan deal lasting until 2 January 2012, alongside George Thorne.[16] He made his debut two days later, starting in the 1–1 draw against Leicester City.[17]
On 31 January 2012, Mattock signed for Championship side Brighton & Hove Albion on a loan deal lasting until the end of the season.[18] On 17 March, he scored in a 3–1 away defeat to Blackpool.[19] In total, Mattock made 15 league appearances for the Seagulls during his loan spell. On 16 May 2012, Mattock was released by West Bromwich Albion after his contract was not renewed.[20]
Sheffield Wednesday
In June 2012, Mattock was expected to complete a permanent transfer to Brighton following his successful loan spell, but instead agreed a three-year contract at newly promoted Championship side Sheffield Wednesday.[21]
At the end of the 2014–15 season, Mattock was one of eleven players released from their contracts by the club.[22]
On 23 October 2023, Mattock signed for National League club Hartlepool United on a short-term loan.[32] He made his Hartlepool debut the following day in a 2–1 defeat to FC Halifax Town.[33] This loan deal was later extended until 1 January 2024.[34] On 5 January 2024, it was announced that his loan spell with Hartlepool had ended.[35] At the end of the 2023–24 season, he was released by Harrogate having made 33 appearances for the club over two years.[36]
International career
After making his first team debut, Mattock was named in the England squad for the U17 Championships in Belgium.[37] On 3 October 2007, Mattock was called up to the England U19 squad for the 2008 European U19 Championship.[38] On 12 November, Mattock was called up to the England U21 squad alongside former clubmate Richard Stearman for the 2009 European U21 Championship qualifiers, making his debut in a 2–0 win over Bulgaria U21 on 16 November. In doing so he became the second youngest player to represent the England U21, behind Theo Walcott.[39] However, he did not make the final squad for the tournament and instead played at the U19 European Championships. He scored his first ever international goal in the group stage and helped England to the final where they lost out to the hosts, Ukraine.
Personal life
Mattock grew up in the Eyres Monsell area of Leicester. On 2 September 2009, he was charged with assaulting four people in the Churchgate area of Leicester.[40][41] In July 2011, Mattock pleaded guilty to a charge of affray and on 23 October 2011 he was sentenced to ten months in prison, suspended for two years, and ordered to complete 150 hours of unpaid work and pay £1,500 costs.[42]
