Sion Cunha played youth football for
Coritiba, before joining Swiss club
Sion at the age of 18 in July 2017, after impressing scouts at the
Dallas Cup youth tournament. In May 2018, he scored a hat-trick in a 4–1 victory over
Thun.
RB Leipzig in 2018 On 24 June 2018, Cunha joined
Bundesliga club
RB Leipzig on a five-year deal. He scored his maiden Bundesliga goal against his future club
Hertha BSC, to mark a 3–0 win in November 2018. He scored a goal against
Bayer Leverkusen in April 2019 that won the Bundesliga Goal of the Month award, and was nominated for the
FIFA Puskás Award.
Atlético Madrid On 25 August 2021, Cunha joined
Atlético Madrid on a five-year deal for an estimated fee of €30 million. He scored his first goal against
Levante to seal a 2–2 draw.
Wolverhampton Wanderers in 2023 On 1 January 2023, Cunha joined
Wolverhampton Wanderers on loan for the remainder of the 2022–23 season, in a deal which stipulated the move would become permanent in the summer of 2023, certain clauses in the loan agreement having been met. Cunha's first appearance was as a second-half substitute in a 1–1 draw away to
Aston Villa on 4 January. His first goal for Wolves came in a 4–2 defeat at home to
Leeds United on 18 March. Cunha's first goal of the
2023–24 Premier League season came in a 3–2 defeat away to
Crystal Palace on 3 September 2023. He scored his first
FA Cup goal, a penalty, in extra-time of a 3–2 Third Round replay victory over
Brentford at Molineux on 16 January 2024. He scored again in the next round against
Wolves' bitterest rivals,
West Bromwich Albion, in a 2–0 victory at
The Hawthorns on 28 January, a goal that led to crowd unrest breaking out in sections of the ground designated for West Brom supporters. On 4 February, he scored his first Wolves
hat-trick in a 4–2 away victory against
Chelsea, becoming just the second Wolves player (
after Diogo Jota in January 2019) to score a hat-trick in the Premier League and only the fourth opposition player to score a hat-trick at
Stamford Bridge in Premier League history. He scored 14 goals over the season. Cunha scored his first goal of the
2024–25 season in a 6–2 home defeat to Chelsea. Cunha also scored in defeats to
Aston Villa and
Brentford before he scored a late equaliser against
Brighton to give Wolves their second point of the season. Cunha then scored Wolves' second goal in a 2–0 win over
Southampton which was the team's first win of the season. Two weeks later Cunha scored a brace in a 4–1 win over
Fulham to lift the team out of the relegation zone. On 14 December, in a 2–1 home loss to
Ipswich Town in the last game before
Gary O'Neil's dismissal, Cunha appeared to elbow an employee of the visiting club in the back of the head, before reaching to the same man's face and pulling his glasses off. Cunha was charged with misconduct by
the Football Association. On 31 December, Cunha was given a two game ban from the FA with a fine of £80,000 following the incident. On 1 February 2025, he extended his contract with the club until 2029 shortly after he scored in Wolves' 2–0 victory over
Aston Villa. Cunha finished the 2024–25 season with 15 league goals, marking a personal best and ranking as his club's highest scorer.
Manchester United On 1 June 2025, fellow Premier League club
Manchester United announced an agreement with Wolves for the transfer of Cunha. On 12 June 2025, United completed the transfer for a reported fee of £62.5m. On 17 August, he made his debut for the club in a 1–0 loss against
Arsenal in the league. On 27 August 2025, during the second round of the
Carabao Cup against
EFL League Two side Grimsby, Cunha missed the winning penalty during a penalty shootout, which would have sent United into the third round of the
Carabao Cup, but after fellow new United signing
Bryan Mbeumo also missed his penalty, United lost. Later that year, on 25 October, he netted his first goal for the club in a 4–2 win over Brighton scoring from outside the box with a low shot. On 25 January 2026, he scored the winning goal in a 3–2 away win over Arsenal, securing his club's first league win at the
Emirates Stadium since December 2017. ==International career==