In 2021, Núñez won the Euroleague Next Generation Tournament with Real Madrid.[2] Although he played in the group games, he did not feature in the final, as he was called up by Pablo Laso to the senior team amidst an injury crisis within the squad.
On 6 June 2021, Núñez made his debut for Real Madrid's senior team in an ACB semi-final win against Valencia Basket, scoring two points from the free-throw line and adding two rebounds and one assist in seven minutes of play.[3] He was the 16th youth academy player to be introduced to the senior team by Pablo Laso.[4]
On 26 July 2024, FC Barcelona signed Núñez on a three-year contract through to 30 June 2027.[7]
NBA draft rights
On 27 June 2024, Núñez was selected with the 36th overall pick by the Indiana Pacers in the 2024 NBA draft, however, immediately on draft night, he was traded to the San Antonio Spurs along with cash in exchange for the 35th overall pick in the 2024 draft, Johnny Furphy.[8][9]