Davie, Fla. ? Miami Dolphins quarterback Trent Green has no plans to hang up his cleats despite his second severe concussion in the past 13 months.

Green was in Kansas City on Wednesday being examined by the same specialists who treated him for last year’s concussion, and coach Cam Cameron said the 14-year NFL veteran was optimistic he would play again this season.

Green lay unconscious on the field for less than five minutes early in the 22-19 loss to Houston last Sunday after his head collided with the knee of Houston defensive tackle Travis Johnson while making a block on a botched reverse. He was taken to a hospital for observation but released shortly thereafter, and he returned to South Florida with the team despite suffering a Grade 3 concussion.

Last season Green missed eight games because of a concussion he suffered on a collision against the Bengals in the season opener.

Cameron talked to Green before addressing the media Wednesday afternoon and said Green was “very encouraged” about his status.

“He’s dealing with the people he dealt with last year so he can make direct comparison,” Cameron said. “He’s really upbeat, if you can imagine. That’s what makes those guys who they are and what they are. They are competitors and think a little differently than the rest of us. They can’t imagine not playing, and they want to be back out there playing as soon as possible.

“With all that being said we’ve got to let this thing play out, and we’ll keep you updated.”

Cleo Lemon, a fourth-year veteran who filled in for Green against the Texans, will get the start Sunday at Cleveland. Lemon took what Cameron estimates as 85 to 90 percent of the snaps with the first-team offense Wednesday.

Rookie quarterback John Beck is more involved with the base offense, but is still running the scout team, preparing the defense by running Cleveland’s plays.

Cameron said the organization had discussed bringing in another quarterback.