Early career Although he started working at a young age, Mazzola continued to cultivate his passion for football; he was the leader of Tresoldi, the team of
Cassano d'Adda, who observed him playing in the fields and introduced him to their youth team in 1934. He briefly moved to Fara d'Adda and then returned to Tresoldi. He played as a
centre midfielder and right-sided
midfielder, even though he was already a multi-purpose player. He participated in his first season with Tresoldi in 1935–36, and the following year he played for the first team, earning 10
lire per game. In 1938, the same period when
Alfa Romeo made him a work proposal that included the possibility of playing in
Serie C, he received an offer from
Milan, with the prospect to play in
Serie A. He was very indecisive and opted for Alfa Romeo as the car manufacturer also guaranteed him a job. At Alfa Romeo he played one season as a
winger; but according to another source, he instead played as a right midfielder. He left the team in 1939, to join the military service in
Venice.
Venezia In 1939, while he was performing his military service in the Navy, he took part in several matches in the team of the Navy, played on the field of basins, putting on a good display, despite weighing 90 kg. He was noted by some observers of
Venezia, who after various stresses succeeded in getting him to tryout; according to another source, a naval officer who was a fan of Venezia, admired the skill of Valentino and offered him to the
Lagunari. At the trial, which he showed up and played barefoot, having left his boots intentionally at home so as not to ruin them. He convinced everyone, especially the
manager Giuseppe Girani to purchase him. After a few months in the reserve team, which participated in its own championship, he was hired on 1 January 1940 for 50,000 lire. He made his debut in
Serie A on 31 March 1940, in a 1–0 defeat away to
Lazio, entering as a substitute for the centre forward Francesco Pernigo, and kept his place in the starting lineup on his own merits. He played in all five of the remaining league games, often in the middle of the attack, creating a goal on the penultimate day against
Bari, guaranteeing Venezia safety from relegation. In a
Coppa Italia round of 16 defeat against
Modena that ended 3–1, he would also score his team's only goal. It was during this time at Venezia that Mazzola first met
Ezio Loik, who had moved to the club from Milan. They debuted together in the 1942 game Italy played against Croatia and won 4–0. Both were very different, although they came from very humble backgrounds: Fiume-born Loik was quiet and somewhat defensive, while Lombard Mazzola was much more impulsive and friendly. Loik did not like Valentino at first instance, taking his reserve for arrogance, but both soon found a way of understanding each other. The partnership of both attacking midfielders (
mezzala in Italian) was based on Loik's stubborn generosity and the Mazzola's rare talent. Soon, they became Italy's most coveted uprising young players. Mazzola's career with Venezia started modestly, with a tenth-placed finish in 1940 and a twelfth-place finish the next season. In 1941, however, the team won the Coppa Italia final against
Roma, and finished third in the league in 1942.
Torino '' shirt in the post–
World War II era In early July 1942, he transferred to
Torino for one million and 250 thousand
lira, a figure that was criticised by the press, and allowed Venezia to restore all its debts.
Juventus had a verbal agreement with Venezia to sign Mazzola. However, Torino eventually offered a record transfer fee plus two players (Raúl Mezzadra and
Walter Petron) and won the player's signature. In the same deal, Torino also signed
Ezio Loik. He officially debuted for Torino on 20 September 1942, in the
Coppa Italia against
Anconitana Bianchi. The match ended 7–0 for Torino, with two goals by Mazzola. On 4 October, he made his league debut for Torino. Both Mazzola and Loik played poorly because of their imprecision and their lack of understanding and were considered responsible for the 1–0 defeat Torino suffered in Milan against
Ambrosiana-Inter. Mazzola initially objected to the position he was played in for over two months, despite the team beginning to put together a series of victories. He scored his first league goal for Torino on 18 October in a 5–2 win over Juventus. In April 1943, he scored three goals in the last four matches of the season; with Torino and
Livorno head-to-head in first place. In the final round, Torino faced
Bari, with Mazzola scoring the decisive goal four minutes from the end of the match, and winning the
scudetto for Torino. In the
Coppa Italia, Torino reached the final, with Mazzola scoring in a 4–0 win over former club, Venezia. In the middle of the Second World War, without prospects of a new season, Torino, whose name changed to Torino FIAT, only played friendly and small unofficial competitions. Mazzola, unlike many of his fellow players, who had returned to play with their home teams, stayed in Turin and, together with his other teammates, and began to train and participate in some games. In the unofficial
1944 Campionato Alta Italia, Torino FIAT finished second to
La Spezia. After the championship ended in July 1944, Mazzola and his teammates played several matches for charity. The league resumed in 1945, and was characterised by the
Campionato Alta Italia. Mazzola contributed 16 goals to Torino's scudetto-winning formation, with five braces; the first in the third round when he scored twice against
Sampierdarenese in Genoa. In this season, Mazzola would also begin rolling his sleeves up to mark the ''quarto d'ora granata'' ("the maroon quarter-hour") when the team needed the extra push. In the 1946–47 season, Mazzola was promoted to captain and finished the season as the league's top scorer with 29 goals. On 20 April 1946, he scored the fastest hat-trick in the history of Italian football, with three goals in three minutes against
Vicenza. Mazzola and Loik would constitute the two points of greatest strength of the formation, with Torino winning their fourth overall Scudetto at the end of the season. Mazzola would continue his form in the 1947–48 season, and after the first seven rounds, he was top scorer with eight goals. On 5 October 1947, at the Stadio Nazionale in Rome, Torino closed the first half with a score of 1–0 for the
Giallorossi; returning from the locker room, Torino scored seven goals in 25 minutes, three of which were scored by Mazzola, who was forced to leave the field prematurely, amid the applause of the entire stadium due to a thigh strain. His physical problems continued in the months of November and December, yet Mazzola continued to play, offering repeated discontinuous performances. On 23 May 1948, the match against
Triestina in Trieste finished goalless; Mazzola refused to pass to his teammates, who showed impatience for his actions. Various interpretations of this event exist: besides the simple justification that the Mazzola wanted to rest, as he was tired and struggling with injuries, there were also rumours that he intended to end his relationship with Torino and move to
Internazionale. Amidst this, Torino would go on to win their fourth consecutive title with five rounds in advance, with Mazzola scoring the decisive goal in a 4–3 win over
Lazio. Mazzola finished the season with 25 goals as the second top scorer behind
Giampiero Boniperti. At the end of the season, Torino were invited to play four friendly matches in Brazil by the
Brazilian Football Confederation; Mazzola before leaving, on 29 June, announced in a radio interview his farewell to Torino, amid the dismay of the fans. A few days before the start of the new season, scheduled for 19 September 1948, six Torino players, including Mazzola, did not return due to a contract dispute. Mazzola, included in the transfer list, would miss the first round of the season against Pro Patria. However, an agreement with the club was reached on 23 September, with Mazzola returning in a 3–2 loss to Atalanta, in which he scored. Mazzola would go on to score the winning goal in the derby, and offered a very positive performance seven days later in a 3–1 win at Padova, scoring a goal and leading the team alone to victory. In early 1949, he had to live with several muscular injuries which caused him to considerably reduce training and gain weight. Despite not being able to fully recover, he scored four consecutive goals between January and February. On 24 April, in the 33rd round, against Bari (1–1), he scored the final goal of his career. On 30 April, Torino drew 0–0 at the
San Siro against Inter; Mazzola, due to a strong sore throat with high fever and a form of
angina, did not take part in the match. On 1 May, the day after the match against the
Nerazzurri, Torino flew to
Lisbon to dispute a friendly against Benfica on 3 May. The match, organised by Mazzola as a farewell to the captain of the
Portugal national team,
Francisco Ferreira, ended 4–3 for the Portuguese. The two had previously met on 27 February, when Italy had beaten Portugal 4–1 in Genoa. Ferreira and Mazzola had met in a restaurant in the afternoon, and discussed the match that Benfica would dedicate to the Portuguese, with proceeds donated to charity. ==Death==