The Spanish playmaker moved to the Liberty Stadium last summer in a club record £5.55million deal.
He has offered glimpses of what he is capable of doing his debut season in the Premier League, but has seen injury and inconsistency hamper his progress.
Hernandez insists a sizeable transfer fee has not weighed heavy on his shoulders and has vowed to raise his game in 2013/14.
The 28-year-old four-cap international said: "I don't think the record transfer fee has been a burden. But it's possible to play better.
"Sometimes I play well and sometimes I play bad, but I always give 100 per cent. But I think I can play well next season.
"Four or five years ago, I played my best football for Valencia and got into the Spanish team.
"I am the same player - I haven't changed since then. But I can play better."