16014276-standard.jpg

Lions receiver Calvin Johnson walks to the locker room after aggravating a right ankle injury. (Patrick Record | MLive.com)

DETROIT -- Add injury to insult.

Moments after Jim Schwartz was carried off the field in Detroit, Lions coach Jim Caldwell said Calvin Johnson has aggravated his sore right ankle and the team has not ruled out the possibility the injury is long term.

Johnson will undergo further testing in the coming days, and his status for next week's divisional game in Minnesota against the Vikings has yet to be determined. "I won't be certain if it's a long-term issue, but he did take a pretty good whack right there on the side of his leg," Caldwell said. "They looked at it, but they'll evaluate him further -- probably tomorrow -- and get a good look at him."

Johnson was not targeted with a pass during the first half of the 17-14 loss against Buffalo, a sign he wasn't 100 percent to begin the game. He aggravated the ankle injury after taking a helmet to his right leg on his lone catch, a little 7-yard slant in the third quarter.

He watched the rest of the game from the locker room, and was not available to reporters afterward.

Johnson initially hurt the ankle two weeks ago against Green Bay. He's practiced just twice since suffering the injury, and combined for three catches in the past two games.

Detroit (3-2) finished the Buffalo game extremely short-handed. Tailback Reggie Bush also suffered an ankle injury, leaving the Lions with just one healthy tailback: George Winn, who was making his NFL debut.

Bush finished with six carries for 13 yards, plus two catches for 30 yards.

"I feel good, but we'll see," Bush said. "I'll speak to the doctors and trainers and we'll take the necessary precautions to do whatever I need to do to get healthy for this week."

Tailbacks Joique Bell (concussion) and Theo Riddick (hamstring) did not dress against Buffalo, though both did attend the final day of practice last week and could be back in time for the Minnesota game.