<P> In sports, the practice squad, also called the taxi squad or practice roster, is a group of players signed by a team but not part of their main roster . Frequently used in American and Canadian football, they serve as extra players during the team's practices, often as part of the scout team by emulating an upcoming opponent's play style . Because the players on the practice squad are familiar with the team's plays and formations, the practice squad serves as a way to develop inexperienced players for promotion to the main roster . In addition, it provides replacement players for the main roster when players are needed as the result of injuries or other roster moves, such as bereavement leave . </P> <P> During the 1940s, Cleveland Browns coach Paul Brown invented the "taxi squad," a group of promising scouted players who did not make the roster but were kept on reserve . The team owner, Arthur "Mickey" McBride, put them on the payroll of his taxi company, although they did not drive cabs . The name stuck, and the practice of retaining a squad of ready reserves spread throughout professional football . However, the NFL did not officially recognize the existence of taxi squads until February 18, 1965 . On that date, the NFL team owners formally adopted a 40 - man active roster supplemented by a taxi squad of unregulated size, which was officially termed the "future list ." Over the next few seasons, the NFL gradually limited the allowable number of inactive players to seven, and regulations were established in relation to injured reserve and waiver practices . In 1974, the NFL eliminated the taxi squad altogether, moving the seven inactive spots into an expanded 47 - man active roster . Beginning in 1977, a more limited inactive system was introduced (often consisting of either two or four players, depending on the season), and these players were sometimes referred to as taxi squad members . The NFL has since reintroduced larger reserve squads, now known as "practice squads ." </P>

How many players are on the nfl roster