Mata is being linked with Barcelona while he's in Brazil for Spain's Confederations Cup campaign.
Mata said: "Obviously it's tough, talking about it physically, but I don't feel down, I still feel fresh and all I want is to play as many games as I can.
"I really enjoyed this season. It was a tough and long for us, but at the end we won a trophy so it was good.
"I really love to play with my national team, so all I can do is train and look forward to playing, because I love to play football."