Maguire salvaged a point for the 'Foxes' with the last kick of the game, despite Claude Puel's side being down to 10-men duo to Daniel Amartey's dismissal.
Speaking to Leicester's in-house TV channel 'LCFC TV', the former Hull man praised the character of the side and expressed his joy at the goal.
"United are a massive club with a great team and we need to try and take the character into the next game against Watford," Maguire enthused.
"We've got a great bunch here and everybody is going to fight to the death. We had to keep it at 2-1 for as long as we could, the manager kept saying we'd get one more chance.
"Thankfully it fell to me and thankfully I put it in the corner. That's the first last-minute goal in my career, so it's a special moment for myself, especially against such a prestigious club.
"Obviously the circumstances make it a bit more enjoyable. We felt like it was a good performance, we were disappointed to go 2-1 behind.
"I had a good chance in the first half, but I learnt from it and thankfully with the last kick I took it first-time rather than trying to bring it down and it went in the back of the net."