"I have felt comfortable at this club from the first minute," said the 25-year-old.
"Time has gone so quickly but the welcome has been amazing.
"The lads are really good and there is a great atmosphere."
"To be honest I didn't train that much last week because of the transfer," he said. "I know I can improve."
"Rooney and Robin are two of the best strikers in the world," said Mata.
"It will be amazing to play alongside them.
"I just want to help them, and help the team win matches.
"We need to sustain this feeling.
"I am always positive. If any club can come back and climb the table it is this one.
"It will take time but hopefully we can go back up the table. That is what we have been talking about in the dressing room.
"We will try to win as many games as we can to the end of the season, hopefully all of them."
Edit - A couple more
"There is a great atmosphere. I am very happy and looking forward to the next game.
"The stadium is unbelievable. The fans are so loud. Even before the game. It has been an amazing time for me.
"Even social media has shown me so much. The amount of fans this club has is unbelievable."
