BOURBONNAIS, Ill. -- Chicago Bears starting left tackle J'Marcus Webb succumbed to 91-degree temperatures Friday, leaving the final full practice session of training camp due to symptoms of heat-related illness.
Webb left the field during the goal-line portion of team drills, and veteran Frank Omiyale took the rest of the repetitions in his place.
Webb's setback on Friday shouldn't affect his availability for Saturday's walk-through practice or Monday night's matchup against the New York Giants.
"It was a hot day today," Bears coach Lovie Smith said. "You know a little heat. He wasn't feeling well right then. So we kept him out."
A second-year veteran, Webb plays arguably the most important role in the offensive line's bid for significant improvement heading into the regular season. Having started 12 games at right tackle as a rookie in 2010, Webb moves to the left-tackle spot, where he'll protect the blind side of quarterback Jay Cutler.
So far, Webb hasn't lived up to the club's faith in him.
Webb struggled in the preseason opener against the Buffalo Bills, and contributed to the starting offensive line's giving up four sacks in one half of action. Webb complicated matters in the aftermath of the shoddy performance with his comments.
Webb said he didn't match the intensity of Bills linebacker Shawne Merriman, who beat the tackle for at least one sack, drawing the ire of offensive-line coach Mike Tice.
Because of Webb's early struggles, the club continues to wrestle with the dilemma of whether to give him more time to improve or move sixth-year veteran Omiyale into the starting lineup.
Omiyale started 14 games at left tackle last season, but the club expected Webb to develop into somewhat of an upgrade at that position.
"Hopefully, they see that I'm ready whenever they need me," Omiyale said. "Everybody this week came out with a different intensity, and we're just ready to go, ready to get after it. It felt good being with the older guys, just letting them know that I'm here for them. I'm able to step in and not cause any mishaps or anything."
Michael C. Wright covers the Bears for ESPNChicago.com and ESPN 1000.