In January 2000, he was signed by Italian Serie A club Udinese via Rentistas for US$6.65 million. He played his first Serie A match on 23 January, replaced Roberto Sosa in the 79th minutes. The match Udinese won Venezia 5–2. He played 14 league matches in the first season. But in September2000, along with Warley, were found using a fake Portuguese passport by Polish officials while heading to Poland for the match against Polonia Warsaw. It followed by an investigation of Italian police, and found 2 more teammate namely Jorginho Paulista and Alejandro Da Silva were using fake passport. It is because Serie A restricted each club could only had 5 non-European Union footballers and 3 in each match, a fake passport could increase their chance to win a contract with Italian club. However, that season Alberto played 27 league matches and scored 2 goals, as the quota system was abolished in the mid of season. In June 2001, Alberto, along with a dozen other including 3 of Alberto's teammate, were banned, 10 of them including Alberto for a year and 3 youth players for 6 months. but allowed to remain at Italy. The ban was later reduced. On 14 April 2002, he played his first league match after the ban, but replaced by Siyabonga Nomvethe at half-time. The match Udinese lost 0–1 to Verona. The then played 2 more seasons, for Udinese.
In January 2005, after just played 2 league matches for the Udine club, he joined another Serie A side Siena. In July 2005, Siena signed him from Udinese in co-ownership deal. He played 31 league matches that season for the Serie A struggler and the Tuscany side choose to sign him permanently in 2006. But in 2006–07 season, he just played 10 starts in 16 Serie A appearances and in 2007–08 season with only 2 starts.
Return to Brazil
In September 2008, he signed a 1½ contract with Clube Atlético Paranaense but only played 8 matches in national leagues.
Managerial career
In 2012, Valentim returned to Atlético Paranaense as an assistant manager. He left the club in the following year, and joined Palmeiras in 2014, also as an assistant. On 13 December 2016, Valentim was announced as Red Bull Brasilmanager. The following 18 April, after a poor campaign in the 2017 Campeonato Paulista, he was sacked. On 24 June 2017, Valentim returned to Palmeiras, again as an assistant. On 13 October, he was appointed interim manager in the place of sacked Cuca. Despite finishing second, he was released by the club on 5 December. On 13 February2018, Valentim was named manager of Botafogo. On 19 June, he resigned after accepting an offer from an Egyptian Club, Pyramids FC. On 18 August 2018, Valentim left Pyramids FC following a dispute with the club's owner "Turki Al Sheikh" regarding the future of the team's striker Ribamar. Just one week later, he has joined Vasco da Gama for the remainder of the Campeonato Brasileiro campaign. Valentim was sacked on 21 April 2019, after losing the year's Campeonato Carioca. On 18 June, he took over fellow top-tier side Avaí, replacing fired Geninho, but returned to Botafogo on 11 October. Valentim was dismissed by Bota for the second time on 9 February 2020, after a poor campaign in the Carioca.
