United struggled to match Newcastle&aposs intensity when they were defeated at St. James&apos Park last season and Eddie Howe&aposs side caused the same problems from the first whistle in Saturday night&aposs meeting.
The North East side created plenty of chances and they were unfortunate not to be leading at half-time, but their pressure eventually paid off shortly after the interval when Anthony Gordon found the net.
Gordon was unmarked at the back post after Aaron Wan-Bissaka lost his man and it was a simple finish to break the deadlock.
Marcus Rashford and Anthony Martial were replaced by Antony and Rasmus Hojlund respectively on the hour mark, but only in the closing stages did United look like equalising and it was too late to secure a draw.
Newcastle deserved their 1-0 victory and Maguire was the player to emerge after the game for post-match media duties.
“The boys are disappointed,” he told MUTV. “I don&apost think we played to our level and it&aposs been a tough week. Three away games, six days, but we don&apost use that as an excuse. We didn&apost play well enough, especially in the first half.
“We grew into the game in the second and maybe could have got a point in the end. We put a lot of pressure on them in the last 10 or 15 minutes, but it wasn&apost enough and I think in the end you have to say they deserved it.
“I think we defended the box well tonight. The other areas of the pitch, we allowed them to get into the box far too easily, so it&aposs something we need to work on, all of us as a team.
“But we didn&apost start the game well enough and we found it hard to pick the tempo up after that. We got caught trying to play out and maybe we were a little bit too open for the first time and it&aposs early in the second half, so we could have gone a little bit longer.
“We know what Newcastle are about. They like to press and they play at a big tempo, especially at St. James&apos Park, they have a great record here. Aaron [Wan-Bissaka] will learn from it and I haven&apost seen it back so I can&apost point a finger at anybody.
“But yeah, it&aposs a disappointing goal to give away, especially away from home.”
Maguire was asked about the upcoming game against Chelsea and he warned United must do better in duels if they are to get a result.