The Kansas City Chiefs' beleaguered offense took another hit Wednesday when right guard Mike Goff went on season-ending injured reserve.
Johnson, who was just 75 yards away from breaking the team rushing record, was released Monday after being suspended for making inappropriate posts on his Twitter account and comments to reporters.
"He's worked real hard. I wouldn't put it past him," Chiefs coach Todd Haley said of Smith. "I'm still trying to keep it within reason and not have the expectations too high and understand really what the situation is. But I would say Kolby Smith's the type of guy who could surprise. I wouldn't say it's out of reason."
Goff, a 12-year veteran, had started seven games for the Chiefs (1-7) before going down with a shoulder injury that has been bothering him since September. He probably will be replaced by Andy Alleman, a three-year veteran who was acquired from the Miami Dolphins in an August trade. Another possibility is Ikechuku Ndukwe, who has backed up right tackle Ryan O'Callaghan.
"Mike obviously was an important piece to us that we signed in the offseason to help a lot of these young guys figure out how to do it," Haley said. "It's disappointing that his season is over. But injuries are a part of this game."
"He missed a couple of plays there, but he fought back and finished the game strong and did some good things," Haley said of Alleman. "We'll have to carry on. Injuries are a part of the game. Guys have to step in and get the job done."
The Associated Press contributed to this report.