It was is 13th league goal of the season.
Mateta said: "I'm very happy, we have a good result and we'll keep doing this until the last game.
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"In the game, when you have chances and you score, it gives a good feeling to the team. It makes you keep running and you do more and more.
"We can beat anybody and you need to act fast after the result.
"I don't have a number in my head but I just know to score more and more. Just score."