1. Massive defensive overhaul in the summer

Coming to the defence, this would not be an easy call for the gaffer to make, but David Luiz and Sokratis Papastathopoulos have made it significantly easier for Ljungberg to bench them for Rob Holding and Calum Chambers. There is no doubt that Luiz and Sokratis cannot play together, and they provide more threat to Arsenal than the opposition.
Which is why a serious overhaul is needed, bringing back the English duo of Holding and Chambers, with Tierney and Bellerin playing as fullbacks. Sokratis and David Luiz, for all the experience they have playing in different countries across Europe, have failed to form a robust partnership at the back for a team who desperately needed an experienced, reliable defence.
They were brought in for the short-term, players who could use their experience to solve the crisis at the back, but the Premier League has proven to be too good a league, particularly for the Greek international.
Ljungberg has been working with this bunch of players for some time now, and now that the ex-invincible has the authority to make decisions, he should not back down at this point. The fans rely on him, and although he clearly won't be blamed by sensible Arsenal fans for the mess, they expect him to help out, in some way or the other.