Hernandez was part of Valencia's youth set-up when Benitez brought the Spanish title to the Mestalla, and the winger believes the 52-year-old could bring glory to Stamford Bridge, if the fans are patient.
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“It’s difficult because on the first day people wanted Rafa out. The fans are passionate, but he needs more games. He has brought in new players and people should judge him after more games.
“In the past, Rafa has been a good coach in La Liga and the Premier League. He won the Champions League for Liverpool. But people at Chelsea are not used to Rafa.”
The Swans face the Blues on Wednesday evening in their semi-final first leg and Hernandez has pin-pointed former Valencia team-mate Juan Mata as the man to beat if the Swans are to snatch a positive result.
“Mata is a big friend of mine. He was my room-mate at Valencia for two years. We used to eat lunch and dinner together too,” Hernandez added.
“He’s a good player and I’m happy that I can play against him and Chelsea. I remember Juan missed the Premier League game against us because he was injured. But he is an important player for Chelsea.
“He won’t be easy to stop, but I have confidence in the Swansea defence.
“Chelsea have a lot of big players and we also have to be wary of [Fernando] Torres and new signing [Demba] Ba. But Mata is a player we need to stop.”