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An Arsenal took time to put together a detailed tactical analysis of how the Gunners could beat Manchester City at the Etihad Stadium- and then David Luiz did a David Luiz.
Prior to Arsenal's first fixture in three months, @AfcJxmes put together an in-depth thread during which he looked at the strengths and weaknesses of the current Premier League champions.
There was focus on the key battles and areas where they game might be won, with plenty of stats and a look at potential systems Mikel Arteta might look to use against the club he used to work for.
But all the tactical analysis in the world couldn't prepare for the Luiz disasterclass that ensued in the 3-0 defeat.
Originally on the bench for the game given his contract situation, Luiz replaced the injured Pablo Mari in the 24th minute.
In a 25 minute cameo, the Brazilian was at fault for Raheem Sterling's opening goal and then got himself sent off after clumsily fouling Riyad Mahrez inside the box and giving away a penalty shortly after half-time.
The former Chelsea and PSG defender didn't shy away from his poor showing though and accepted his blame for the 3-0 defeat.
"It was not the team's fault, it was my fault," the former Chelsea defender told Geoff Shreeves in a post-match he requested to do.
"I take the decision to play, I should take another decision in the last two months that I didn't. Today the team did well, especially after we went down to 10 men, the coach is amazing, all the players did amazing, it was just my fault."
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