Jose Mourinho has added the Portuguese midfielder to his ranks amid an injury crisis.
The 21-year-old has been handed the number 30 shirt at Spurs. The club have the option to make his move permanent at the end of the 2020-21 season.
He expressed his delight, stating: “It’s one big dream to come to this big club.”
The lack of depth across the middle of the park has costed the team valuable points in recent weeks.
Fernandes came through the youth ranks at Benfica before graduating to the senior squad in 2018.
He has established himself as one of the brightest young prospects in the Primeira Liga.
The Portugal U21 international could be in line to make his Tottenham debut when they take on Watford at Vicarage Road on Saturday.
Fernandes is a box-to-box midfielder by trade, and could inject much-needed energy in Tottenham’s starting XI at this crucial period.
What Next?
Mourinho’s side must beat Watford at the weekend to stay in the hunt for a top-four finish.
Spurs have already slipped to eighth in the Premier League table after 22 fixtures, nine points adrift of fourth placed Chelsea.
After their clash with the Hornets, Tottenham will look ahead to a meeting with Norwich on January 22, before taking on Southampton in the FA Cup fourth-round tie three days later.