Juan Mata admits when he first heard of Manchester United's interest he thought 'Wow'.
The former Chelsea midfielder has joined United for a club record £37 million.
"It's a very happy day for me, meeting my team-mates, the manager, seeing the training ground. It's a massive club and I feel very proud to be here," said Mata.
"I thought, 'wow'! This is a team that has won a lot of leagues in the history of the Premier League and English league. It's amazing knowing that a club like Manchester United is interested in you. It's a good feeling.
"I know it is a big price but I'm confident that everything is going to be okay. I will try my best as I always have done. The squad and the manager are very good and the fans are unbelievable - we have everything to be successful."
