Jack Wilshere faces three months out as Arsene Wenger reveals extent of Arsenal midfielder's ankle injury I don't think it was a tackle with the desire to hurt. I think he went for the ball, but it was a late tackle, a tackle which a young player can do. It was a bad foul. The loss of Wilshere compounds a terrible three weeks for Arsenal following back-to-back Premier League defeats against Swansea City and Manchester United, as well as the 3-3 draw against Anderlecht after leading 3-0. Arsenal have made their worst start to a Premier League season, with Alisher Usmanov, the second largest shareholder, claiming on Monday that the club need to strengthen in every single position seriously to challenge the elite of English football. He also pointedly suggested that Wenger is failing to learn from past mistakes and is being restricted by his footballing principles. Wenger claimed on Tuesday to have a "very good" relationship with Usmanov, who he said that he "liked very much," but responded forcefully to the criticism. "We have values at this club," Wenger said. The first one is when we go through a difficult patch, we show solidarity. That is a very important one. The second one is that, when you have something to say to each other, we say it face to face. We don't need to go to the newspapers. When you're from this club, you're from this club. You're in or out, you cannot be both. What is important is how close we are together inside the club and how much we can respond to people who question our quality. Wenger also remains convinced by his players and believes that he actually has his best squad since the break-up of the Cesc Fabregas/Robin van Persie/Samir Nasri team. I'm long enough in the game to know if there's something there or not. There's a lot there. It is one of the best teams I've had for a long time. We are the team who has the least shots against us in the Premier League. We are the team who creates most chances. There's a lot of positives but, at the end of the day, you either win or lose. It depends on very little things sometimes. Asked if he questioned himself and whether Arsenal were in crisis, Wenger said: "When you are so long in football, you don't really understand what crisis means. I best get to the dictionary. I believe in what I do and I believe specially in my players. Even after throwing away both the lead and their chance to top Group D against Anderlecht, Arsenal need only a draw against Borussia Dortmund on Wednesday night to qualify for the last 16 for a 15th consecutive season. One significant boost is the availability of Laurent Koscielny in central defence following acute tendonitis in both ankles. As well as Wilshere, Theo Walcott and Wojciech Sczcesny are definitely out with respective groin and hip injuries while Danny Welbeck will be assessed on Wednesday morning after missing training on Tuesday because of a tight hamstring.