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Monthé was a youth player at Queens Park Rangers before signing a professional contract for the 2013–14 season. He was loaned to Southport in March 2014. He made seven appearances before returning to the Rs where he was released at the end of the season.
He joined Bath City for 2016–17 season, After an impressive 5 months in his performances scoring 4 goals in 19 appearances Monthé was signed by Forest Green Rovers in November 2016 agreeing a two-and-a-half-year contract for an undisclosed fee.[3] Monthé was part of the Forest Green side that were victorious in the National League play-offs at the end of the season which saw the club promoted to the EFL for the first time in its history. He made his English Football League debut against Barnet on 5 August 2017. In February 2018 he joined Tranmere Rovers on loan which Monthé gained a second promotion in the National League (English football) The loan was made permanent at the end of the season for an undisclosed fee.[4]
Tranmere Rovers
On 26 June 2018, Monthé signed to Tranmere Rovers F.C. after an impressive loan spell on for an undisclosed fee agreeing a one-year contract. The left footed centre-back made 43 league starts appearances scoring 2 goals during 2018–19 EFL League Two in total over 50 starts in all competition season securing a third promotion to League One in 2019 EFL League Two play-off final.
On 11 June 2019 after a momentous season, Manny Monthé signed a new two-year contract with Tranmere Rovers F.C. The 24-year-old dominant centre back, who won the club's Young Player of the season, had been instrumental in helping the Rovers secure back-to-back promotion to the 2019–20 EFL League One. Monthé turned down interest from numerous clubs to remain at Prenton Park. During the 2019–20 EFL League One season Monthé made 31 league starts scoring 1 goal, being involved in Tranmere's 2019–20 FA Cup run scoring two goals in the third round tie against Watford F.C. setting up a fourth round tie and losing against Manchester United F.C.