The Spain international has been heavily linked with the two North London teams but maintainins he is focusing on the new season in Spain
Following a number of encouraging performances last term, the 23-year-old impressed for Spain's Under-21 side that won the European Championships in Denmark last month.
Despite all the transfer rumours, Mata was quick to allay suggestions he could be leaving Valencia, insisting his priority is achieving full fitness before the start of the season.
"It is true that teams have been linked with me but this is a good sign that I am playing well," Mata told Lasprovincias
"Despite all the rumours, I have to stay calm and step away from all the speculation. I am well aware of the rumours but this is not the first summer I have had to deal with this so they do not worry me.
"My aim now is to make sure I am ready for the start of the new season and keep improving as a player. I want to win more trophies."