Vélez Sarsfield player in 2020 Barreal began his career with
Vélez Sarsfield.
Gabriel Heinze promoted the midfielder into the club's first-team squad at the beginning of
2018–19, selecting him for his professional debut on 2 September at
La Bombonera against
Boca Juniors; he was substituted on for
Lucas Robertone with thirty-two minutes remaining. He netted his first goal on 3 February 2019 against
River Plate. He signed a three-year contract with a club option for a fourth year. Reports out of Argentina listed the transfer fee in the range of $1.5 to 1.7 million for 75 percent of the player's rights, with
Vélez Sarsfield retaining 25 percent of any future sale. Also noted was the potential of $250,000 additional for a set number of appearances. Barreal made his debut on 7 October in a 3–0 defeat away to the
Philadelphia Union at
Subaru Park, having replaced
Frankie Amaya early in the second half. Barreal joined 10 other players on the shortlist for the world's "most beautiful goal" of the year. He was the fourth active
MLS player to be nominated for the award, and the first since a 2018 goal by
Zlatan Ibrahimović for
LA Galaxy.
Loan to Cruzeiro On 1 March 2024, FC Cincinnati announced a loan with purchase option on an undisclosed fee to
Cruzeiro through December 2024. He was regularly used for the club during his spell, scoring twice in 42 appearances before departing in December.
Santos in 2025 On 6 February 2025,
Santos announced the signing of Barreal on a one-year loan deal, with a buyout clause. After nursing an injury, he made his club debut seventeen days later, replacing
Yeferson Soteldo late into a 3–0 away win over
Inter de Limeira. Barreal scored nine goals for
Peixe in the
2025 Série A, being the club's top scorer in the competition. On 17 December 2025, FC Cincinnati announced his permanent transfer to the club, after certain conditions over an obligatory purchase were met. ==International career==