Concussion to apparently sideline Ben Roethlisberger

PITTSBURGH — Steelers quarterback Ben Roethlisberger is expected to sit out Sunday night's game at Baltimore because of a concussion, an unexpected development that apparently means inexperienced Dennis Dixon would make his first NFL start.

Roethlisberger practiced all week despite sustaining his fourth concussion since 2006 during a 27-24 overtime loss in Kansas City on Sunday. During his only interview of the week, he said Thursday he had been cleared to play.

However, Roethlisberger continued experiencing headaches resulting from the concussion — his knee struck the knee of Chiefs linebacker Derrick Johnson as he leaned headfirst during a running play in overtime — and he began debating the wisdom of playing.

Foxsports.com first reported that Roethlisberger would not play. The Steelers continue to list Roethlisberger as questionable, meaning there is a 50-50 chance he will play.

The Steelers were so convinced Roethlisberger would play, they did not sign an experienced quarterback even after backup Charlie Batch broke his left wrist a few plays after replacing Roethlisberger. Batch will miss most or all of the rest of the regular season.

Roethlisberger's apparent decision to not play occurred in the same week the NFL has taken a heightened stance on protecting players from head injuries.