Despite scoring 20 goals, Torres has endured a mixed season, but he has improved since the arrival of manager Rafael Benitez, and Hernandez believes that the former Liverpool forward has improved under the 52-year-old's guidance.
The former Valencia player told Wales Online: "I think Rafa is a help for him. The best moments for Fernando were with Rafa at Liverpool. He is a manager who seems able to help Fernando.
"And I think you can see he has recovered his confidence in the last few months and games, and now is a better moment for Fernando.
"But I hope he has a quiet day against us. I said to him before the cup game, 'Do not score' and he didn't. I hope that happens again."
Hernandez has scored three times in 25 Premier League appearances in his first year in England.