Mata has become a key figure in west London since arriving from Valencia in 2011 and was crowned the club's Player of the Year for the second season running after playing a major role in the side's Europa League success and third-place finish in the Premier League.
Recent reports suggested returning Blues boss Jose Mourinho would be open to selling Mata, but the 25-year-old insists he is ignoring all transfer gossip and is concentrating solely on winning the Confederations Cup with Spain.
"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," he told Sky Sports. "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."
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