Ousmane Dembele

Dembélé made his senior debut for Rennes' reserve side in the Championnat de France Amateur, on 6 September 2014, coming on as a 78th-minute substitute for Zana Allée. He effectively set up Alseny Kourouma for the second goal of a 2–0 home win over the reserves of Breton rivals Guingamp. On 9 November, he scored his first career goal, again coming off the bench in a game at the Stade de la Piverdière, this time against the reserves of Laval. He totalled 13 goals in 18 games in his first season, including a hat-trick on 16 May 2015 in a 6–1 win over Hérouville.

On 6 November 2015, Dembélé made his professional debut for Rennes' first team in Ligue 1 against Angers, replacing Kamil Grosicki for the last 5 minutes of the game. On 22 November, he scored his first Ligue 1 goal for the first team against Bordeaux, opening a 2–2 draw at Roazhon Park. On 9 January 2016, Dembélé found the net again for Les Rouges et Noirs, as they came from 0–2 down to draw 2–2 against regional rivals Lorient at home. On 6 March, he scored his first Ligue 1 hat-trick in a 4–1 victory over Nantes in the Derby Breton.

On 12 May 2016, Dembélé signed a five-year contract with German club Borussia Dortmund, effective 1 July. On 14 August 2016, he made his debut in a 2–0 defeat against Bayern Munich in the DFL-Supercup. He scored his first goal for die Borussen on 20 September 2016, in a Bundesliga encounter against VfL Wolfsburg, which Dortmund won 5–1 at the Volkswagen Arena. On 22 November 2016, he scored the first Champions League goal of his career as the German club defeated Legia Warsaw 8–4 in a group stage meeting.

Dembélé was called up to the senior France squad for the first time to face Italy and Belarus in August 2016 after Alexandre Lacazette and Nabil Fekir withdrew through injury. He made his debut on 1 September against the former at the Stadio San Nicola, replacing Antoine Griezmann for the final 27 minutes of a 3–1 friendly win over Italy. On 13 June 2017, Dembélé scored his first France goal in a 3–2 friendly victory against England.

On 26 April 2017, Dembélé assisted Aubameyang's goal and scored the 74th-minute winner against Bayern Munich in the DFB-Pokal's semi-final, helping Dortmund reach the cup final. In the decisive game on 27 May, he scored the first goal of a 2–1 victory as Dortmund clinched their first major title in five years by winning the 2017 DFB-Pokal Final against Eintracht Frankfurt. Dembélé was subsequently named Man of the Match. After the end of the season, Dembélé was named to the Bundesliga Team of the Season and awarded the league's Rookie of the Season award.

On 25 August 2017, La Liga side Barcelona announced that they had reached an agreement to sign Dembélé for €105 million plus a reported €40 million add-ons. On 28 August, he had his medical and signed a five-year contract, with his buyout clause set at €400 million. Barcelona had just sold Neymar to Paris Saint-Germain for €222 million, so the deal meant that Dembélé became the joint-second most expensive player (in euros), along with Paul Pogba. Rennes received a reported €20 million from Borussia Dortmund as a result of the sale, and Évreux 27 were also due part of the fee. He was handed the number 11 jersey that was previously held by Neymar.

Dembélé made his debut on 9 September as a 68th-minute substitute for Gerard Deulofeu in a 5–0 Derbi barceloní win over Espanyol at the Camp Nou, assisting the final goal by Luis Suárez. In his first league start eight days later at Getafe, he injured his hamstring and was ruled out for four months. He was given the medical all-clear on 2 January 2018, but a couple weeks later, he again injured himself against Real Sociedad and was ruled out for up to four weeks. On 14 March 2018, Dembélé scored his first goal for Barcelona, netting the second goal in a 3–0 second leg win in the Champions League round of 16 against Chelsea. On 17 April, he scored his first La Liga goal for Barcelona, notching the opening goal in an eventual 2–2 draw with Celta Vigo. On 9 May, Dembélé scored twice, marking the first brace of his Blaugrana career, in a 5–1 home victory over Villarreal. Dembélé won both the Copa del Rey and La Liga winners' medals in his first season in Spain, with the 20-year-old scoring four goals in 24 appearances across all competitions.

On 12 August 2018, Dembélé scored the winning goal against Sevilla in the Spanish Super Cup, in an eventual 2–1 victory to win Barcelona their 13th Supercopa de España title. He opened his La Liga season's goal tally by scoring the only goal of the game against Real Valladolid, on 25 August, away at the José Zorrilla. A week later, on 2 September, Dembélé notched his first home goal of the season, as the Blaugrana demolished newly promoted Huesca 8–2. Dembélé was again on the scoresheet the very next game, on 15 September, netting his third match winner of the ongoing campaign in a 2–1 away victory over Real Sociedad at the Anoeta. On 18 September, Dembélé scored his first Champions League goal of the season, helping Barça defeat PSV Eindhoven 4–0 at the Camp Nou. Coming on as a substitute against Real Madrid, on 28 October, Dembélé set up Arturo Vidal's last goal of the game in a 5–1 home El Clásico triumph. Just a week later, again appearing from a bench role, he inspired Barcelona to a 3–2 comeback away against Rayo Vallecano, scoring the 2–2 equalizer with a half-volley in the 87th minute.

On 17 May 2018, he was called up to the 23-man French squad for the 2018 World Cup in Russia. On 15 July, he was an unused substitute, as France beat Croatia 4–2 in the final.

In March 2019, Barcelona president Josep Maria Bartomeu insisted that Dembélé, "Is better than Neymar," who previously played for the club.

Dembélé injured his left hamstring in the opening match of the 2019–20 La Liga season, a 0–1 defeat against Athletic Bilbao, and was expected to miss five weeks. In February 2020, he suffered a serious hamstring tear and, following surgery, was not expected to return for six months. This would mean despite the extension of the season due to the COVID-19 pandemic, he would miss the rest of the season.

On 28 October 2020, Dembélé scored his first UEFA Champions League goal of the season in a 2-0 victory over Juventus.