New Orleans Saints running back Reggie Bush has a fractured fibula in his right leg, sources tell ESPN NFL Insider Adam Schefter.

The injury is not expected to end Bush’s season, sources said, indicating he could return in four to six weeks. More tests were scheduled for Tuesday.

Bush had to leave Monday night’s 25-22 victory over San Francisco in the fourth quarter. Bush, who said he would likely get X-rays after the team returned to New Orleans, had an ice bag wrapped around his right leg in the locker room and was using crutches to get around.

“I’m just trying not to think the worst and just try to stay as positive as I can in this situation,” Bush said. “That’s all you can do, hope for the best.”

A source close to Bush told ESPN’s Colleen Dominguez that the running back could miss six weeks.