Marc Colombo, who suffered a dislocated left kneecap on Nov. 18, 2002, and hasn't played since, is better suited to right tackle. He started five games on the left side as a rookie before his injury, but considering the lengthy rehab and the absence of any assurances that he'll come back at 100 percent, he would be a huge gamble as the blind-side protector for presumed-franchise quarterback Rex Grossman.
Steve Edwards started all season at left guard, but he was always a right tackle before injuries to other players forced him to switch.
Terrence Metcalf played left tackle for two of his four years as a starter at Mississippi, but he is no more an NFL left tackle than Gandy.
Massive Aaron Gibson started all season at right tackle as a stopgap solution, and he could also move inside, but forget about Gibson handling speed rushers at left tackle.
All that being said, the Bears need a major upgrade at left tackle through free agency, trade or the draft.