But even with a few new faces, Dein feels it would be foolish to demand Wenger delivers a trophy this season.
"Any chairman or manager who comes out publicly and says they are going to win a trophy is deluding themselves," Dein said.
"Who know what can happen in football? Mistakes happen, you get injuries, suspensions.
"But Arsene is very focused and determined - I see him regularly and he still has as much fire in his belly as he had when he started. He wants to win. I do believe in his ability.
"Arsenal are expecting success all the time but that's not easy - you cannot turn on a tap and guarantee to win games.
"He will admit he has probably had the most difficult couple of years of his career - for two reasons. One is the fact the game is getting more competitive. There is money coming in and it is more intense.
ARSENAL'S PREMIER LEAGUE RECORD SINCE 2003-04
2003-04 - champions
2004-05 - second
2005-06 - fourth
2006-07 - fourth
2007-08 - third
2008-09 - fourth
2000-10 - third
2010-11 - fourth
"Secondly, he had to contend with the fact that he hasn't achieved what he would have hoped to achieve - albeit he has done remarkably well in the quality and style of play, but he and the fans want to win trophies.
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