Early in his career, Mendes played for Cádiz, Roquetas and Poli Ejido, making appearances in the Segunda División B, before moving to England with Radcliffe Borough. A brief spell at Stalybridge Celtic followed before moving to Welsh-based Northern Premier League Division One North club Colwyn Bay. He was voted supporters' and manager's player of the year during his two years at the club, and also scored their last ever goal in English football before the club transferred to the Welsh league system.[2][3][4]
In July 2019, after an extended trial with Crewe Alexandra, Mendes signed for Cymru Premier club Bala Town.[4] He signed a new contract in May 2022, to extend his stay for a further year.[5] In January 2023, Mendes was sent off in a Welsh League Cup fixture for throwing the ball into the crowd.[6]
On 12 May 2023, Mendes signed for National League North club Hereford on a one-year contract.[7][8][9] He was suspended for the first three league fixtures of the season due to the red card received in the Welsh League Cup earlier in the year. He made his debut in the fourth league fixture of the season, after the expiry of his suspension.
Mendes returned to Bala Town in June 2024 after one season with Hereford.[10]