NFL Insider explains the practice squad rules
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From the NFL Owners Meetings: Approved 2023 Playing Rules, Bylaws and Resolutions
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NFL practice squad: Rules, eligibility, size, salary, more - Big Blue View
How and Why the NFL Practice Squad Works
NFL practice squad, explained: Eligibility, size, rules, salary, more - Pats Pulpit
Sidelines are crowded because NFL teams are carrying 90-man rosters throughout preseason - ABC News
NFL brings back emergency third quarterback rule - NBC Sports
How Much Do NFL Practice Squad Players Make?