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04/28/09 6:49 PM ET

Dickerson better day after collision

Reds outfielder likely to sit until at least Friday

CINCINNATI -- Reds left fielder Chris Dickerson on Tuesday seemed to be coming out of the fog he felt after a nasty head-to-head collision with Astros shortstop Miguel Tejada.

One night earlier, the injury left him looking a little like a fighter that went 15 rounds.

"I feel fine. There is no dizziness," Dickerson said on Tuesday. "There is still a little bit of a headache. The mental processing is a little bit hazy, I noticed during that test."

Dickerson took a slew of concussion tests that measured his reaction time, memory and depth perception. He also took some vision tests.

"My reaction time was actually better than my Spring Training score," Dickerson said.

Still, it's unlikely that Dickerson will play again until Friday. It was believed a trip to the disabled list wouldn't be needed.

"The fact is he's gotten much better in a short period of time," Reds manager Dusty Baker said. "We have an off-day Thursday. He should hopefully be better and ready on Friday."

In the fourth inning of Monday's 4-1 loss to the Astros, Dickerson was trying to break up a double play by sliding into second base when Tejada fell into him and they knocked heads.

Both players continued in the game, but Dickerson had to exit before the sixth inning after his vision blurred and he felt woozy.

Although Dickerson was officially diagnosed with "concussion-like symptoms" on Monday, he's no stranger to the feeling of concussions. The 27-year-old has suffered four of them in the past.

"I crashed into a wall in Dayton," Dickerson explained. "I crashed into the wall in college. I hit my head on the backboard in basketball trying to slam dunk. The problem was the backboard was metal. That was in elementary school on a lower rim. Another one was on a playground messing around with a tether ball [when the pole tipped and hit me]."

In 17 games this season, Dickerson is batting .205 with one home run and five RBIs. His single in the fourth inning snapped a 0-for-10 slump.

Darnell McDonald started in left field for the Reds on Tuesday.

Mark Sheldon is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.