On 23 January 2013, Dieng made his debut for Brest in the Coupe de France, coming on as a substitute at half time in the 3–1 victory over CA Bastia.[7] On 18 May 2013, Dieng made his Ligue 1 debut, starting in the 3–1 loss to Paris Saint-Germain.[8]
Oldham Athletic
On 14 July 2014, Dieng joined English League One side Oldham Athletic on a two-year contract.[9] Dieng made his debut for the club, starting and playing for 63 minutes against Leyton Orient.[10]
Bradford City
In July 2016 Dieng signed for League One club Bradford City on a two-year contract following a trial.[11] He scored his first goal for Bradford in an EFL Trophy tie against Stoke City Under-23s on 30 August 2016.[12] He was offered a new contract by Bradford City at the end of the 2017–18 season.[13] He left Bradford in June 2018.[14]
Southend United
In June 2018 Dieng signed for Southend United on a two-year contract after turning down a contract offer from Bradford City.[15] Under Sol Campbell's management, Dieng became an integral member of the first team, and was appointed captain.[16]
Exeter City
On 20 July 2021, Dieng joined League Two side Exeter City on a free transfer, signing a one-year deal.[17] On 3 December 2021 he signed a contract extension, tying him to the Devon side until 2024.[18]
On 23 April 2022 he was named as the side's Player of the Season for 2021–22, 4 days before Exeter secured promotion to League One.[19] He was also named in the League Two Team of the Season for 2021–22.[20]
Gillingham
On 11 January 2023, Dieng dropped back down to League Two, signing for Gillingham after an undisclosed release clause was triggered.[21]
Personal life
Born in France, Dieng is of Senegalese descent.[22] He is the older brother of the footballer Nathanaël Dieng.[23]
Career statistics
As of 2 December 2023
Appearances and goals by club, season and competition
^"Timothee Dieng - The Interview". Priestfield Review - Season 2023/24 Official Matchday Programme: 28–33. 2 December 2023. When I was a kid I wanted to be a goalkeeper....mid-season I got bored in goal so I started to play as a striker