I didn't expect what happened to Manchester United in the extra time. Anyone who sees the result of the match will believe that Arsenal demolished Manchester United totally not knowing that the extra 2 goals came from 90 + 5. Manchester United lost the energy they started with during the ending of the match. I do not understand when you say fatigue because they had test time before another match. Infact, Champions league matches have not started and why are they facing fatigue. So what will happen when the Champions League matches start. Manchester United needs to sign good players to sustain the standard of the club.
Manchester United and Arsenal should have ended in a draw but in reality Manchester United's defense in the final minutes had begun to weaken so that Arsenal took good advantage of it and finally made Arsenal win with a score of 3-1, Mancehster United should not have been like this, they were seen underestimating Arsenal so in the last minute they conceded and greatly disappointed their fans and from that defeat Manchester United dropped out of the top ten positions.
Many people said that Manchester United defence was weak in the ending time but what I observed was that Manchester United players were all attacking minded immediately the score was 2:1 in favour of Arsenal. They just wanted to equalize immediately and Arsenal capitaled on their attacking mind and scores 1 more goal to make their total number of goals 3.
Arsenal is strong this season, just as strong as they were last season. And also this season, their squad depth has increased which is what makes them candidates for trophies this season.