The Portuguese came off the bench to score an incredible hat-trick in the 4-0 win.
Nuno said on Jota: "We're really pleased. When you make a substitution, you want to change to the game.
"You try to find the best solution for the team. Sometimes it works out, sometimes it doesn't.
"But this is what we want, for players to come in and make an impact.
"Diogo did fantastically well. Well done. What he's been doing every day and the way he is on the pitch, he's always fighting.
"He's always running. When you have talent, the goals come. But you have to keep going."