Colts lose huge championship piece: LT Glenn, 31, to retire

Others seen as possible replacements for Glenn include veteran Ryan Diem, in a switch from right tackle, and Charlie Johnson, a rookie last year who started the second half of the Super Bowl after Diem was injured.

"Obviously, it's hard to replace a player of Tarik's ability," team president Bill Polian said. "He hardly ever was injured, but you prepare for that as a team, so we have players that are going to have to step in."

Polian wouldn't speculate on the Indianapolis lineup as the team prepares for the start of training camp on Sunday in Terre Haute.

"We've got a lot of good players on the offensive line," he said. "Virtually any player can play any position. ... Right now, it's a question of working through all the permutations."

Team owner Jim Irsay said he met with Glenn for about three hours Monday night, but did not try to get him to change his mind.

"I just want to make sure, face to face, he was sure about this decision. ... I could tell he was. It's tough, but we're going to go forward," Irsay said.