Jose Mourinho inflicted a shocking defeat on his former club as Spurs thrashed the Red Devils 6-1 at Old Trafford last month.
To their credit, Manchester United have responded well to the humbling loss, beating Newcastle United, PSG and RB Leipzig and drawing to Chelsea in their subsequent four matches.
Ole Gunnar Solskjaer’s side smashed Leipzig 5-0 in the Champions League on Wednesday and Maguire opened up about the club’s recent form following the victory.
‘After Spurs, we were all devastated and just three games into the season it felt like it was a big crisis,’ the England defender told MUTV.
‘It was quite a strange feeling, but we don’t expect to lose games at Old Trafford and we definitely don’t expect to lose games like we did.
‘The first three games we were conceding far too many chances. So as a defensive unit, having kept the most clean sheets in Europe last season, we knew we had to improve to be more solid.
‘We have worked hard on the training ground and since the international break we have gone back to not conceding chances like last year, when we were a solid unit and a solid base.
‘It has been important, for me as a defender, to give the forward lads every opportunity to go and win the game.
‘One, two, three goals it should end up in a win. At the moment we are doing that. It’s a start, but it is still an early win in the season.
Maguire, who has impressed recently after a miserable period for club and country, added: ‘It is the start of a European campaign where we want to be successful.
‘We don’t want to stop in the group stage; we want to get through and be successful in the knockout stages.
‘That is the standards we have set and the expectations we have set. Last season you have seen a lot of our top performances brought out great results.
‘We know we can get to the level and the level has to be hit more. It has got to be more consistent.
‘I think you have seen that since the international break. We have come back with a great mentality. We needed a reaction. The only way was up.
‘We had a bad start to the season, we knew that. We have had a good reaction [since].
‘Obviously, [we’re] disappointed not to win the game against Chelsea but we have another big game at the weekend [against Arsenal] and one we have to perform in like tonight.’