WESTFIELD, Ind. —The Indianapolis Colts announced today that they are placing three offensive linemen on the Active/Non-Football Injury List ahead of the start of training camp practices.

Tackle Anthony Castonzo, tackle/guard Denzelle Good and tackle Austin Howard were each placed on the NFI list Wednesday, the day before 2018 training camp practices are set to begin for the Colts at Grand Park Sports Campus in Westfield, Ind.

The three players will count towards the team's 90-man roster.

Similar to the Active/Physically Unable To Perform (PUP) list, the Active/NFI allows for players who are listed by the start of camp to return to the practice field anytime they are ready before the start of the regular season. The primary difference between the PUP and NFI lists is that players on NFI suffered their injuries while they were away from their teams.

As of Wednesday, we know Castonzo was possibly going to miss the first couple of days of practice after recently suffering a hamstring injury during a private workout, Colts general manager Chris Ballard told reporters last week.

But we don't quite know what injuries led to both Good and Howard being placed on the NFI list. Colts head coach Frank Reich is scheduled to talk with reporters on Thursday prior to the start of the team's first training camp practice.

The team was already going to be without three other players for Thursday, each of whom were placed on the Active/PUP list earlier this week: safeties Clayton Geathers and Malik Hooker and guard Jeremy Vujnovich.

With Castonzo (the team's starting left tackle), Howard (who was mostly working with the first-team offense at right tackle during the offseason workout program) and Good (believed to be the top backup at both left and right tackle heading into camp) out for at least Thursday's practice, look for the likes of Joe Haeg, Jack Mewhort and Le'Raven Clark to get plenty of reps at both left and right tackle throughout the day.