The 22-year-old failed to make a single Premier League start in his 12 months at Spurs.
The Portugal Under-21 international is over halfway through an 18-month loan from Benfica.
Fernandes has played just 63 minutes this season and is yet to feature in the Premier League.
Mourinho has revealed that Fernandes could return to Benfica after making just one appearance for Spurs this campaign.
Fernandes could be on his way out of North London in January after failing to become a first team regular at Spurs.
The squad was announced on Thursday morning after Mourinho had to make some tough decisions...
Have Spurs been enticed by the Benfica name and reputation rather than Gedson Fernandes as a player?
Mourinho confirmed Fernandes will play some part against Watford
Gedson Fernandes is thrilled at the prospect of working under Jose Mourinho following his "dream" move to Tottenham.
Gedson Fernandes, 21, reportedly chose to join Mourinho at Spurs ahead of London rivals West Ham.
Jose Mourinho has reacted to rumours that Tottenham are set to sign Gedson Fernandes on an 18-month loan deal.
Man Utd want a discount on Bruno Fernandes or to use two players in part-exchange. Meanwhile, Grealish is in demand...
Both London clubs have reportedly made bids for Fernandes.
Are Man Utd about to sign Arturo Vidal after all these years? Probably not. Plus Mario Gotze is going free.
The player has a €100m exit clause in his contract, but Benfica are known to be ready to sell him for a fee nearer €40m.
Man Utd have now turned their attention to their £50m Plan B, while Chelsea are seeking clarity over a striker...
Liverpool, Man United and Spurs all want Gedson Fernandes. But who is 'making the bigger play'?
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