Brian Urlacher also fined

LAKE FOREST, Ill. -- The Chicago Bears fined veteran Brandon Manumaleuna $22,000 for failing to attend mandatory team meetings Saturday evening in advance of the Bears' season opener against Detroit, according to an NFL source.

Meanwhile, the NFL fined Bears defensive end Julius Peppers $5,000 for a hit to the helmet of Lions quarterback Matthew Stafford. Brian Urlacher also was fined $5,000 for a late hit on a Lions offensive lineman after Tommie Harris recovered a fumble.

According to a source close to the player, Manumaleuna mistakenly believed the meeting schedule in the regular season would mirror the preseason schedule, which called for the meetings to take place the day of the game.

However, all four preseason matchups occurred at night, but the season opener kicked off at noon.

The Bears moved quickly in free agency to sign Manumaleuna to a five-year, $15 million deal that includes $6.1 million in guarantees.

The 30-year-old Manumaleuna, who played for Bears offensive coordinator Mike Martz in St. Louis, underwent a knee operation in the offseason that caused him to sit out OTAs and a portion of training camp.

He is currently listed as the first-team fullback on the Bears' depth chart.

Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000.