KISSIMMEE, Fla. -- Astros catcher Humberto Quintero traveled to Houston on Tuesday to have his ailing back examined by team medical director Dr. David Lintner.

Quintero, who hasn't seen Grapefruit League action this spring because of his back, said he will get a cortisone shot on Wednesday and return from Houston later that day. If all goes well, Quintero hopes to be back on the practice field Thursday, with hopes of playing Friday against the Blue Jays.

"I'm feeling better," Quintero said.

Quintero said trainers told him he could have some inflammation in one of the disks in his back, which could be pinching a nerve and causing discomfort down his right leg.

Meanwhile, third baseman Jimmy Paredes, who has yet to appear in a spring game because of left wrist inflammation, will face live pitching Tuesday afternoon on one of the Minor League fields. Infielder Angel Sanchez (back), whom manager Brad Mills said isn't as far along in his recovery as Paredes, will take two sets of batting practice with the coaching staff and track pitches with Minor Leaguers. Mills said they will both go to Viera, Fla., for Thursday's game against the Nationals.

In other injury news, first baseman Carlos Lee is in the lineup for the first time Tuesday for the game against the Mets. He was brought along slowly because of a hamstring strain.