Bush, who was scheduled to undergo an MRI after injuring his knee Sunday against the Arizona Cardinals, could be available to play in Week 3 against the Washington Redskins, a source familiar with the injury told ESPN NFL Insider Adam Schefter.
Schwartz acknowledged that Bush will be sore but said that the results of Monday's tests were "encouraging."
"The tests today were encouraging," Schwartz said Monday. "He's going to be sore but he doesn't have anything that is going to be long term."
However, Schwartz also emphasized that Bush's injury might not be a short-term one.
"It's too hard to speculate on injuries," Schwartz said. "That's why I usually don't."
Bush injured his left knee when it collided with the helmet of Arizona safety Tony Jefferson during his 26-yard catch in the second quarter of Sunday's 26-21 loss. He grabbed it immediately, left the game and returned later.
After the game, Bush said he was cleared to return but didn't have the same explosiveness after he ran in the third quarter. He also indicated he didn't think his knee injury was too serious. The tests ran Monday appear to confirm that.
Schwartz also said Bush's only concern is the knee injury, not the groin or thumb injuries he suffered in Detroit's season-opening victory against Minnesota.
ESPN's Adam Schefter contributed to this report.