Smith suffered high ankle sprain, a person familiar with his condition told ESPN NFL Insider Adam Schefter. It is uncertain how much time, if any, Smith will miss.
"I'm just going to try to walk to the plane without too much pain and see how it feels in the morning," Smith said.
Smith had only two catches for 11 yards before he went to the sideline with the Panthers in the lead, 14-13.
Information from The Associated Press was used in this report.