The 27-year-old is set to replace Scott Sinclair, who is set to join Manchester City.
Hernandez played under Swansea boss Michael Laudrup, whil the Dane was in charge of Getafe.
The winger has made over 100 appearances for Valencia.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?