An NFL team has 53 men on its roster not counting injured reserve.
55
No
The Steelers, like any other NFL team have 53 players on their active roster.
in your mind
All of them.
100
A player on injured reserve remains on the team but cannot participate on the active roster for the remainder of the season.
A NFL roster has 53 players. A team is also allowed to have a practice squad, a group of developmental players. The practice squad is can have as many as 8 players on it. Therefore, there are a total of 61 spots on an NFL roster. As you can see by the limited numbers of spaces available, there is a lot of competition to achieve a roster spot in the NFL.
How many players can be on a NBA roster
How many players can be on a NBA roster
The roster for the Indianapolis Colts can be seen on the NFL webpage--please see related links below.