Chicago Bears middle linebacker Brian Urlacher suffered a left calf strain on the opening series Saturday night and was ruled out for the remainder of a 32-17 preseason home loss to the Oakland Raiders.
Urlacher was injured on the second play of Oakland's opening 81-yard touchdown drive.
Urlacher called the injury "no big deal," according to the Chicago Tribune.
"On like the third play, I was running and I felt like a cramp," Urlacher told the Tribune. "Then, on the next play, I couldn't put pressure on it. Then I was out. ... I had a similar-type injury (in 2007) on a Tuesday, and I ended up playing that Thursday (at Washington). I'm not going to speculate on how long, but I'll be fine."
Urlacher, who has been selected to six Pro Bowls in his career, played in only one regular-season game a year ago before being placed on injured reserve with a wrist injury suffered in the opener against the Green Bay Packers.
In 2004, Urlacher missed seven games with a lower left leg injury that required surgery to relieve the pressure of internal bleeding.
The Associated Press contributed to this report.