Former Nottingham Forest defender on trial with Luton
The 22-year-old was born in Guinea Bissau and started his career with Vitória Setúbal, making his debut against Taça da Liga.
He moved to the City Ground and became a regular for the U23s, nominated for the Premier League 2 Player of the Month in October 2021.
Fernandes made two first appearances for the Reds last term in the Carabao Cup matches with Bradford City and Wolves, before being released once Forest reached the Premier League via the play-offs.
The full back starts against Hitchin this evening, as the Hatters kick-off their pre-season campaign at Top Field.