ARLINGTON, Texas -- After a few days of headaches and nausea, Texas Rangers outfielder Craig Gentry is headed to the disabled list.

The Rangers removed Gentry from the active roster today and placed him on the newly-created seven-day disabled list for concussions. The move is not retroactive, making Gentry eligible to be activated on Aug. 4 at Detroit, the final game of the upcoming six-game road trip that starts at Toronto on Friday.

Gentry, who said he was feeling better prior to Thursday's game against the Minnesota Twins, has experienced concussion-like symptoms since Sunday when he hurt his head and neck sliding into Toronto's Aaron Hill.

The Rangers recalled catcher Taylor Teagarden from Triple-A Round Rock to take Gentry's spot on the roster.

"We just want to make sure that everything is right with him," Rangers manager Ron Washington said. "He's too valuable for us. "

The Rangers opted for the cautious approach because Gentry said he has had four or five concussions in his life, including three over the past two seasons. The right-handed hitter, who began the season in Round Rock, is hitting .265 with the Rangers playing mostly against left-handed pitchers.

Major League Baseball instituted the seven-day DL in March to provide club's wary of placing a player on the 15-day DL greater flexibility to address head injuries.