Arsenal welcome Napoli to the Emirates Stadium on Tuesday in a battle for top spot in Champions League Group F.
The Serie 'A' side have been in impressive form themselves during the start of the season, and enjoyed a winning start in Europe by beating last year's runners-up Borussia Dortmund in the first round of fixtures.
The form of the Gunners has been a surprise to many, with Arsene Wenger's side sitting top of Premier League and unbeaten since their opening day defeat at the hands of Aston Villa.
However, the north London club's success has come as no shock to the former Chelsea and Liverpool boss.
"I am expecting a strong team because I think Wenger is the best coach in the Premier League," said Benitez, according to talkSPORT.
"They have signed good players, at this point everything going well for them. Wenger is a great manager, a great person, someone who knows the league in England.
"He has experience in Europe, Arsenal are always top four and he is doing great job. Hopefully he can win [the Champions League], but another year, not this one."
The Spanish manager also admitted that he has kept a keen eye on the goings on in the English top flight, despite his exit for Italy in the summer.
With the likes of Manchester United, Manchester City and Chelsea showing some inconsistent form, Benitez expects the usual suspects to be at the top of league come May.
"Arsenal have great manager and a good team, Liverpool they continue growing, so the second year with a new manager, everybody is expecting them to be in the top four and are doing well," added Benitez.
"The other top sides are not at the level at the moment, they have new managers too, but I think it will only be a matter of time before you see five or six teams at the top, who will be more or less the same as before."
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