The Detroit Lions violated the work rules outlined in the league's collective bargaining agreement on May 27 during one of their organized team activities (OTAs).

The team announced that the breach pertains to an on-field physical contact violation during the session.

As a result, the Lions are forfeiting one of their remaining OTAs on Monday, June 10, which will give players an extra day off.

"We take very seriously the rules set forth within the NFL's Offseason Program and have worked to conduct our practices accordingly. We will continue to be vigilant with our practices moving forward," the team said in a statement.

NFL CBA rules prohibit physical contact in early stages of offseason training

As outlined in the collective bargaining agreement, practices conducted during phase three of the offseason program, which spans the sixth, seventh, eighth, and ninth weeks since the official start of the NFL offseason workouts last April 15, are not allowed to include drills with live contact.

The May 27 session was seven weeks removed from April 15.

The Lions started their offseason program with three days of OTAs from May 21 to May 23, followed by another three OTA practices from May 29 to May 31. Additionally, they held a mandatory minicamp from June 4 to June 6.

They are scheduled to have another three days of OTAs from June 10 to June 12, but the first day of those sessions has been canceled due to the violation.