Wenger’s team have bounced back from 3-1 defeat to Aston Villa on the opening day of the premier league season to win all of their last nine games with full of confidence.
The Gunners will face Napoli in the Champions League at Emirates Stadium.
“I am expecting a strong team because I think Arsene Wenger is the best coach in the Premier League,” Benitez told PA.
“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 here in England.
“He has experience in Europe, Arsenal is always top four and he is doing great job. Hopefully he can win [the Champions League], but another year, not this one.”
Napoli and Arsenal both won their first group game of Champions League season, beating Borussia Dortmund and Marseille respectively.