The Gunners boss thinks that a second victory at Old Trafford this season would show progress for his side.
The Gunners beat Louis van Gaal’s side in an FA Cup quarter-final tie back March, the first time they had won at Old Trafford since 2006.
That win, coupled with the Premier League victory over Manchester City away from home this season and another on Sunday would show that Arsenal have overcome a mental hurdle, according to Wenger.
“First of all we can mathematically put a distance between [Man United] and us in the top four and basically secure the top three,” he said.
“Also, we can make a symbolic statement because we won over there in the FA Cup. To reproduce that would be psychologically important. To do it again would convince us more that we have the strength and can be even stronger next season and show that we have made progress.”
The Frenchman does, however, concede that winning at Old Trafford will not be easy. His side have been in impressive form throughout 2015, allowing them to cement a standing inside the Premier League's top four and secure themselves Champions League football for next season .
However, Monday’s defeat to Swansea at the Emirates was both frustrating and disappointing for Wenger’s side, and has led to all too familiar questions of whether Arsenal can seriously compete for the title next season.
Wenger, though, is simply focusing on his side’s excellent away form ahead of the trip to Old Trafford on Sunday and hoping that will continue. He concedes that a draw or a win would be a great result for his side, given their history of bad showings on the red half of Manchester.
“Since January we have produced consistent performances and we have also been very strong away from home,” he added.
“We have an opportunity to show that we have made progress. Any result will be a positive result. A draw or a win would be great for us. What we want is to show that we are a solid team.”