In 2018, after his contract with Cádiz expired, Mbaye went on trials at Elche CF and Real Murcia,[2] and reportedly signed a deal with French side ES Troyes AC on 24 August of that year, after the club reached an agreement with Watford for his loan.[4] In January of the following year, after not having international clearance to play,[2] he moved to Croatian side NK Inter Zaprešić.[5]
In July 2019, Mbaye returned to Cádiz, being again assigned to the B-team now in Segunda División B. He began the season as a starter in a 2–1 home win over Murcia, with the latter team later presenting a complaint to the RFEF and claiming Mbaye was ineligible to play;[6] the appeal was denied in November.[7]
On 3 March 2020, FIFA suspended Cádiz from signing new players for two transfer windows, after Watford claimed the player still had a valid contract with them.[8][9] The following day, Mbaye said in a press conference that he never signed any deals with Watford.[2] On 13 March, he was sidelined for the remainder of the season after fracturing his tibia.[10]
Cádiz's suspension was lifted in May 2020,[11] but Mbaye only returned to action the following January. He made his first team debut for the Yellow Submarine on 7 January 2021, starting in a 0–0 away draw (5–4 penalty win) against Pontevedra CF, for the season's Copa del Rey.[12]
On 1 July 2021, the Court of Arbitration for Sport definitely cancelled Cádiz's suspension, and condemned Watford to pay the expenses of the process while also paying a compensation to Cádiz and Mbaye.[13] Mbaye continued to feature for the B-team, before making the 2022 pre-season with the main squad.[14]
On 9 June 2022, Mbaye renewed his contract with Cádiz until 2024.[15] On 9 August, after impressing in the pre-season,[14] he was definitely promoted to the first team in La Liga.[16]
Mbaye made his professional debut on 10 September 2022, starting in a 4–0 home loss against FC Barcelona.[17]
On 4 September 2024, Mbaye joined Liga Portugal 2 club Vizela on a one-year contract with the option to extend.[18]