Zaha struck for victory over Southampton on Saturday.
"Wilf is a world class player," Townsend said. "I think he would be a main player for anyone in the world, we're grateful we've got him - he was the match-winner on Saturday and I'm sure he'll help us get some wins and some goals between now and the end of the season.
"We have made a good start, we've got some good players and a top manager, we've made some good signings, we are trying to go to the next level as a team and a football club. If we have a good window between now and when it closes we can have a good go this season."