Minho Province
Born in Braga, Minho Province, Fernandes joined FC Porto's youth academy at the age of 10. On 15 August 2015, still a junior, he made his senior debut with their reserves by coming on as a 59th-minute substitute in a 2–1 away win against C.D. Santa Clara for the Segunda Liga. He scored his first goal in the competition on 16 September 2017, helping the hosts defeat C.D. Nacional 2–1.