Maguire admits the team cannot afford to repeat last season's dismal 15th place finish in the Premier League.
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"I just want to be part of a successful team this season," Maguire told MUTV. "I think last season was a tough season for everyone individually, but also as a team, as a squad, as a club.
"This season, there are no excuses. We're going to have a lot of time to prepare for the Premier League games, and we've got to make sure we're ready.
"So, for myself, it's making sure I'm available, I'm fit, I'm ready to go, and give everything I can to this team and this club."
Last season's league finish was the worst for United in 51 years.