The 2011 and 2012 MLS Cup champions have recruited some experienced players in the offseason - in the way of Rob Friend, Stefan Ishizaki and Baggio Husidic - while Brazilian striker Samuel has joined on loan from Fluminense.
Double that with the development of youngsters such as Gyasi Zardes and Jack McBean and Arena, who signed a multi-year deal recently, is excited about the season ahead.
"You never know until the real games come around but I think they're doing well. It's been a good preseason," said Arena this week.
"It hasn't been too rushed; I think we've had a method to our madness here, and I think it's paid some dividends. I'm hopeful over the next couple of weeks we can clean it up a little bit more and be prepared for the first three games of the season."
Of the new players, Arena said: "They need some time, they're still in transition with this team.
"Last year in the positions they're playing we had less talented and less experienced players. I think that adds up to be a real plus for us."
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