Born in Araçatuba, São Paulo, Allan rose through the ranks as a youth product of Internacional. Goal Brazil’s deputy editor Rodrigo Calvozzo claimed Allan "was always treated by Internacional as one of the most important players in the team."[3]
Liverpool
In the summer of 2015, he joined English Premier League club Liverpool for a fee of £500,000 after impressing the club's coaches at the Frenz International Cup.[4]
On 2 September 2015, he was loaned to Finnish club Seinäjoen Jalkapallokerho (SJK) on a short term deal.[5] Allan scored on his debut eight days later, coming on in the 56th minute for Jussi Vasara and opening the scoring sixteen minutes later in a 1–1 draw away to KuPS.[6] He finished the season with one goal in eight appearances, in the process helping the club win the Veikkausliiga title.[7] On 29 October 2015, Allan returned from his loan spell to Liverpool, greeting the new manager of the club, Jürgen Klopp, for the first time.[8]
On 18 January 2016, Liverpool announced that Allan had been loaned to Belgian club Sint-Truiden for the remainder of the season.[9] He then returned to Liverpool in expectation of receiving a British work permit, which was not granted.[10]
Allan signed for Hertha BSC on 5 August 2016 on a season-long loan deal, after Klopp recommended him to Hertha head coach Pal Dardai.[11]
On 31 August 2017, Allan joined Cypriot side Apollon Limassol on a season-long loan.[12]
In July 2018 he signed a new deal with Liverpool and joined Eintracht Frankfurt on a season-long loan.[13]
On 15 February 2019, Allan joined Brazilian side Fluminense on loan until the end of the season after his loan spell in Germany was cut short.[14]
On 2 July 2023, Allan has been officially announced as Flamengo's new player. Mengão signed him from rivals Atlético Mineiro for a €8.2m transfer fee plus future bonus clauses.[16]
Style of play
A central midfielder by trade, Allan is primarily left-footed and employs a strong passing range, honed with time spent as a deep-lying playmaker in Brazil. Allan has proven himself a useful box-to-box midfielder with promising attacking instincts.[3]