Much was made of his side's crushing 3-1 home defeat by Manchester United last week being the first English match screened in 3D but Wenger needs no special glasses to see the confidence draining out of his side.
Arsenal's season appeared to be coming to the boil when they went top of the table in January but a miserable 11-day period in which they lost in the FA Cup at Stoke City, drew 0-0 at Aston Villa and were then outclassed by champions United has seen it blow up in their faces.
To their credit, they responded to a 3-0 home defeat by Chelsea in November with a hot streak that propelled them back to the top, albeit briefly, but they look fragile now and ill-equipped to win the club's first silverware for five years.
Wenger normally shields his players from criticism but even he looked at a loss to explain Sunday's setback at home to United - questioning his players mental strength.
"We were naive," Wenger said. "We never had any cohesion, offensively or defensively. We were completely not at our level. Why? I believe there are some mental reasons in there."
Wenger was inactive in the transfer market and fans will again be questioning the manager's instincts, especially with main striker Robin van Persie out for the season and Eduardo's fitness unreliable.
Easy on the eye they may be, but Arsenal cannot boast serial winners like Chelsea's Frank Lampard, John Terry and Didier Drogba or the likes of Paul Scholes, Rio Ferdinand, Wayne Rooney and Ryan Giggs at United.
"I think we are in a good position now, we are in the top, we know very well Manchester is a fantastic opponent, it will be a long race until the end of the season," he said.
"We need all the players in good condition and involved until the end of the season. Now every game is very important and every game can decide the future of the season."
"We just want to keep winning, to put Chelsea under pressure," United's South Korean midfielder Park ji-Sung, who scored against Arsenal, told the club'
