San Francisco quarterback Alex Smith knew the feeling immediately after Charles Johnson's 275 pounds landed on his left shoulder.
Fearing he has the same injury that cut short his 2007 season -- only this time to his non-throwing shoulder -- Smith said after Sunday's 23-20 loss to Carolina that he planned to fly to London with the team and get an MRI there. His playing status for next week's game against Denver is uncertain.
"It's definitely the AC, I think. It's very similar," Smith said, referring to the acromioclavicular joint that's sometimes called a separated shoulder. "But I don't know to what extent. There's not really much to say right now."
Smith, who was injured on a third-quarter sack, said X-rays were negative, but he was wearing a black sling after the game. His injury is complicated by San Francisco's travel schedule. The team was to fly directly from Charlotte to London after Sunday's game.
"As of right now, we'll have to wait and get an MRI," coach Mike Singletary said. "We'll see how that works out and go from there."