The Spaniard has missed the last seven games for the Swans after suffering a hamstring injury against West Bromwich Albion last month.
However, the winger is hoping that he will be back in action at the Liberty Stadium at the weekend after a difficult spell on the sidelines.
"It was a shame for me because I felt I put in my best performance so far this season against West Brom, and then I pick up a hamstring problem," Hernandez told the club's official website.
"I've had to miss seven games so it has been a frustrating period. But now I feel stronger and more confident of being available for the Sunderland game. This week has been very important for me and hopefully, with a couple of more days training, the manager will see that I am ready for this game.
"It is an important fixture for us because we need to start picking up points at home. But we know Sunderland have a new manager in Gus Poyet, so the players will be looking to do everything to impress him and get a good result."
Swansea host Sunderland on Saturday in the Premier League.