"I feel, since the start of the season, that we have a strong spirit and are highly determined," Wenger told arsenal.com.
"The response we gave in the second half against Udinese gives us a lot of strength and credit. It convinces me that this team has the ability to respond. And of course there is another opportunity to do that against Manchester United on Sunday.
"They are definitely [still the team to beat]. For us to beat them would be a great boost and would put us in a great position. We did it at the end of last season and would like to do it again."