As you can see on the picture in the first tweet, Manchester United used the same 4-2-3-1 defensive shape they used against Manchester City in the FA Cup final. Just like Guardiola's team, Arsenal started the game in a 3-2 (+GK) shape in the buildup.
United's aim with the narrow line of 3 players behind the striker was to limit the space for Arsenal's double pivot, and make it hard to progress the ball through central areas.
Because United using a +1 in their backline to cover, Gabriel is the free man, so Antony had to move closer to him, but this creates a 2v1 against Mainoo with Havertz and Tomiyasu.
The funny thing is that in the last situations Arsenal pressed worked well and forced United to quickly go long, but they still conceded beacuse Gabriel miskicked the ball.
Arsenal at this moment is a work in progress with the new signings and some new dynamics in terms of roles in the team, but the performance against United was simply not as bad as some might want to sell it.
There are also a lots of positives from Manchester United, especially in the build up phase where they used lots of clever rotations to progress and draw out Arsenal players to create quick transition like situations. Their level will definitely go up with Onana in goal.
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