"Carra is the type of player who wants to play all the time," Enrique told Press Association Sport.
"You cannot say anything about a player who has played more than 700 times.
"And I know it has been a difficult year for Skrtel because he has not been playing as much but last year he was the best centre-back and this year he is the worst.
"But I train with Martin every day and he is a top centre-back. For me Danny (Agger) and Martin are the best centre-back partnership in the Premier League.
"You can have one year good, one year bad. It happened to me.
"The players who play in the Premier League are there because they have quality and confidence.
"It is all about confidence. Martin is an incredible lad and a top player."