Carreira made his first team – and La Liga – debut on 17 October 2020, starting in a 0–2 home loss against Atlético Madrid.[4] He scored his first goal in the category nine days later, netting the equalizer in a 1–1 away draw against Levante UD.
On 20 July 2021, Carreira renewed his contract with the Celestes until 2025, and was loaned to Segunda División side CD Mirandés for the season.[5] On 6 August of the following year, he moved to fellow league team Villarreal CF B also in a temporary deal.[6]