Sidnei was used intermittently during his first season in Portugal, but still managed to appear in 24 Primeira Liga games and score three goals in as many wins, including the 2–0 derby home win against Sporting CP on 27 September 2008.[4] In November, Benfica bought another 50% of his rights for €2 million, and GestiFute acquired the rights to receive 30% from any future transfer.[5] He played only five league matches the following campaign – ten competitive appearances – as the club won the national championship after a five-year wait.
After spending the first half of 2010–11 on the bench, Sidnei was propelled to the starting XI after David Luiz moved to Chelsea in the winter transfer window.[6] On 21 February 2011, he was sent off in a league game at Sporting but his team still managed to win it 2–0[7] and, later the following month, he renewed his contract for a further three seasons until 2016;[8] however, due to poor performances, he lost his starting place to Jardel.[9]
In early June 2011, Beşiktaş J.K. agreed with Benfica on a one-year loan, with the option to make the move permanent.[10] On 19 September he scored a brace for the first in his career, helping to a 3–1 Süper Lig home victory over MKE Ankaragücü.[11]
As the Turkish club opted against exercising its option,[12] Sidnei returned to Portugal and found himself demoted to the B team.[13] On 29 July 2013, he and Pizzi were loaned to La Liga's RCD Espanyol on a one-year deal.[14]
Deportivo
On 1 September 2014, Sidnei moved to fellow league side Deportivo de La Coruña also on loan.[15] After making 32 appearances to help his team avoid relegation,[16] his loan was extended for a further year.[17]
Sidnei had a contract running until 2018, with the Galicians sharing his rights with Benfica and GestiFute.[18] He scored his first goal in the Spanish top division on 5 December 2016, helping the hosts rout Real Sociedad 5–1.[19]
On 19 July 2018, Deportivo announced they had reached an agreement with FC Krasnodar over the transfer of Sidnei.[20] The deal was called off two days later, however, with the player having been unable to agree terms.[21]
Betis
In August 2018, Sidnei joined Real Betis also from the Spanish top flight on a four-year contract.[22][23] On 31 August 2021, after 64 official matches,[24] the 32-year-old terminated his contract with the club.[25]
Cruzeiro and Goiás
On 13 December 2021, Sidnei returned to his home country after nearly 14 years, signing for Cruzeiro Esporte Clube.[26] The following 25 March he terminated his contract and joined Goiás Esporte Clube,[27] but also left the latter on 5 July having totalled just seven appearances for both sides.[28]
Las Palmas
Sidnei returned to Spain in July 2022, agreeing to a one-year deal at second-tier UD Las Palmas.[29]
^Centeno, Álex (19 July 2018). "Sidnei ya está con el Krasnodar" [Sidnei is already with Krasnodar]. La Voz de Galicia (in Spanish). Retrieved 22 July 2018.
^Candal, Adrián (2 August 2018). "Sidnei firma hasta 2022 por el Betis" [Sidnei signs for Betis until 2022] (in Spanish). Cadena SER. Retrieved 3 August 2018.
