Mathieu Flamini is convinced Jose Mourinho's decision not to block the sale of Petr Cech makes the Gunners real title contenders.
Former Blues goalkeeper Cech secured a move to the Emirates after 11 seasons at Stamford Bridge. Mourinho didn't want the Czech international to join Wenger's team but Chelsea owner Roman Abramovich made the deal happen.
However, speaking ahead of the Community Shield clash against Premier League champions Chelsea - at Wembley this Sunday, Flamini believes securing the 33-year-old’s services is a big plus for Wenger's side.
"I was surprised by Mourinho because he really doesn't do that," said the midfielder, as quoted in Thursday morning's Daily Telegraph.
"He's a competitor and usually doesn't like to sell any players to his rivals, but it's a good favour for us and now we have to take advantage. It's a top signing. That's why we have been lucky on this one.
"It's very important. Not only for his quality but also for his character. When you play at the top level, the leaders on the pitch make the difference. Not only when things go well but especially when things go bad.
"So, for us, Petr Cech is a top signing. He is someone with character, someone with a winning mentality.
He added: "I can feel Arsenal now is different to the club I left in 2008. I don’t think any of the key players left in the last two years. It’s a great example.
"And each year we have added quality players like Mesut Ozil, Alexis Sanchez and Petr Cech. These are players who can make the difference at any moment. So I think we have a very good chance."