French underwent season-ending surgery on his ankle prior to being placed on injured reserve Wednesday, Joel A. Erickson of The Indianapolis Star reports. French had been poised to open the season as the top backup to starting center Ryan Kelly before succumbing to the injury. Indianapolis signed undrafted free agent Ryan Coll to replace French on the roster, though rookie fourth-round pick Tanor Bortolini and fifth-year lineman Danny Pinter are more likely candidates to step in as Kelly's backup.