DETROIT – The Detroit Red Wings are listing backup goaltender Jonas Gustavsson as day-to-day with a pulled groin, but general manager Ken Holland said he could be out 3-4 weeks.

“Don't really know,'' Holland said. “We'll see how the next few days go.''

It's highly unlikely Gustavsson will be ready for the start of the regular season in one week against Buffalo, which is why the Red Wings are preparing to go with Petr Mrazek as Jimmy Howard's backup.

“It's tough to say how long it's going to be,'' Gustavsson said. “They took some pictures, but you never really know with groins how long it's going to take, could be a few days or longer than that.''

Gustavsson, injured while trying to make a save in the final minute of Saturday's 2-0 preseason loss to Boston, said he hasn't received the test results.

“With groins, especially for a goalie, you got to be 100 percent,'' Gustavsson said. “You use them a lot. If I was a defenseman or forward it would be something else because you don't put as much pressure on it.

“That's the tough part, to know exactly how long that's going to take.''

It's frustrating for Gustavsson, who has a history of early season groin issues. He pulled his groin during a relief stint in last year's season opener and missed several weeks.

“In your career you're going to have some setbacks, you can't be too low about that,'' Gustavsson said. “Just got to do whatever you can to get back as soon as possible.''