Hernandez was part of the Spanish side which beat Scotland 3-2 at Hampden last Tuesday but it could have been more if it had not been for Allan McGregor between the posts.
And he expects more of the same form from the Rangers goalkeeper in midweek.
‘’He made some amazing saves, it was a fantastic performance," Hernandez told BBC Scotland.
"Certainly had it not been for him we would have scored a few more goals on Tuesday.
"But obviously he was one of a few Rangers players playing for Scotland and who have been playing at that level and at European level for some time, so it's going to be a very difficult match.
"It could be pretty similar to the game between Scotland and Spain, in the sense that they'll be more physical and will battle hard, while we may have more possession.
"But, in any case, it'll be interesting to come up against these players again."
Hernandez was also impressed by 40-year-old, David Weir, and the way he played against Spain for Scotland.
"He's older, but there's obviously a reason for him still playing at that level. The demands of football - at international level and Champions League - couldn't be higher and he showed that he can still perform well."
And the Spanish winger is aware of the type of atmosphere that Valencia can expect on Champions League night.
"The fans at Hampden made an unbelievable noise and I'm certain the Rangers supporters will do the same. Scottish fans really get behind the team, but that's something we'll appreciate."
Valencia go into the match on the back of a 2-1 defeat at the Camp Nou by Barcelona.
Hernandez had initially giving his side the lead but Barcelona fought back in the second half to grab all three points, resulting in the visitors slipping to third in La Liga.