That job appeared ticketed for rookie Morlon Greenwood when training camp began, but a foot injury has kept Greenwood on the sidelines.
There is no clear timetable as to when Greenwood will be able to play, but it's clear he won't start against Tennessee on Sept. 9.
"We're anticipating that Twan will be our starter," Wannstedt said. "He has played with the first group the entire season. ... Greenwood isn't going to become a starter in a week's time. It would be wishful thinking to have him on special teams."
As far as the left tackle position is concerned, Wannstedt still hasn't decided between Marcus Spriggs and Spencer Folau, and he appears in no hurry to do so.
"It's going to come down to a gut feeling," Wannstedt said. "If I say this is the guy that's starting, you know what, the other guy might play some, too. I'm not saying we're going to lock somebody in for the season or for two games."
Two other spots appear to have been decided — at least for the opener — with Jeff Ogden slated to return punts and rookie Chris Chambers tabbed as the kick returner.
"There's something about Chambers that I like," Wannstedt said. "Besides having the speed, he's strong. You notice how many tackles that he breaks after the catch or with the ball in his hand. He didn't do it (return kicks) at Wisconsin after his freshman year. He's really just getting the feel for it."