With games against the likes of Liverpool and Manchester City coming up, the January signing says United is confident of securing Champions League qualification.
Victory over West Brom on Saturday moved United into sixth place in the table and extended its unbeaten run in the league to four games.
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Mata, who moved to Old Trafford from Chelsea in January, is confident United can carry momentum through its upcoming fixtures.
"It is a crucial month for us and, to be honest, I am very positive about it," he told MUTV. "I can feel [confidence] in the players that we have and the things that we can do.
"We know that we have to win as many games as we can until the end of the season and we have to start with this month. We play against very big teams like Liverpool and Manchester City and we will try to win as many points as we can."