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Saka is still injured, of course it is detrimental to Arsenal because Saka's contribution is quite large for Arsenal this season. With Saka's absence, of course, the strategy changes are rearranged, Arteta must see the good potential that other players have when Saka is absent. The next few matches are certainly quite tough for Arsenal such as against Tottenham, Aston Villa.
All players play a big role in their team but if Saka absence is what going to stop the team from progressing, the Arsenal has failed in everything they have built so far. How many times has Haaland went to injuries all these 4 years they have used to win the Premier League, the impact is there and when he is not around they see it but Guardiola makes a solution to it, same goes with Kevin DB absent and yet the team played beautifully but Arsenal says Saka is injured. Common!
At this stage, Nottingham forest shouldn't be who they should be trying to avoid, Liverpool should be their main target for now. They have played 20 games which means they are even ahead of Liverpool in terms of played match but Liverpool is ahead of them with points which means they will be doing extra work, big enough to win all the matches they have next and hope that Liverpool don't win their games, the chance of that is very low though.