United have no European football this term after finishing last year in seventh place, though Mata is determined to put that right in the coming campaign.
"We are facing a new season with new goals," Mata is quoted as saying by the Daily Mail. "It's a new era and we have a new manager and players. It's a new chance to show that this club can fight for titles.
"We would all love to win the league but the most important goal - what this club needs - is to play in the Champions League again.
"I cannot imagine a Champions League two years in a row without United."