Mata's season began as part of Spain's victorious Euro 2012 squad, then he played in the Olympics.
He has featured in more than 60 games for Chelsea, whose 68th and penultimate game of the campaign comes at the Amsterdam ArenA.
"It's been a long season in terms of the amount of games, but I think it's good," Mata said. "I'm really happy with the season personally, but it's not finished yet.
"It can be even better, if we win the title."