Benitez has entered the Stamford Bridge fray surrounded by plenty of criticism from the Blues supporters, especially after picking up just two points in his first three games in charge which includes the weekend's 3-1 loss to West Ham United.
Ahead of tomorrow night's vital Champions League fixture against Nordsjaelland, in which Chelsea needs to win and hope Shakhtar Donetsk beat Juventus to progress, Mata feels that things will change under Benitez.
"We are trusting him because Rafa wants the best for the team," said Mata.
"If we want to win the Club World Cup, or the Premier League or the other competitions, we have to do better.
"Rafa is a very experienced manager and he's trying to help us. We're trying to help him."
He added: "The players have to be professional and work no matter who the manager is of the team.
"We have an owner. We have people who are working, trying to do their best for this club and, as a player, I just have to work with the manager we have now.
"Now it's Rafa."