Tackle eligible

The play is tackle-eligible when it starts from a forward pass. Coaches try to create mismatches between the offensive and defensive lines inserting the offensive tackle playing as an eligible receiver. The formation transforms as there are two players including the catching tackle on one side and three linemen on the other.

Most football variations consider tackles as ineligible receivers. They wear jerseys with numbers 60 to 79. But some leagues allow them to change eligibility if the coaches or quarterback inform the referee about this. A player must leave field for a single play before and/or after changing the status.

The principle listed above is used in the NFL. Offensive tackles become eligible for a single play. The offense informs the referee about the changes and the latter announces that via its microphone. If the team ignores the rule, it gets a penalty for illegal substitution.

College rules are stricter than professional ones. The tackles can’t change their eligibility at once. They must change the jersey on the eligible number. The only exceptions are waiving kicking formations. Any team is allowed to use extra receivers and tight ends during field goals and extra points. These options are accessible in fourth down or before the end of the half. High school level bans such plays – the defensive players with numbers 50 to 79 can’t change their status.