Cleveland Browns rookie quarterback Johnny Manziel acknowledged Saturday that he was late for a team meeting last Monday morning because he misread a schedule change.

"It was an honest mistake and something I need to learn from and make sure it doesn't happen again," Manziel said.

Manziel said he does not believe his tardiness related to Pettine naming veteran Brian Hoyer as the starter for this Monday's exhibition game at the Washington Redskins.

Manziel also said he isn't ready to begin the regular season as the starter. But that doesn't mean he can't be prepared for the Sept. 7 opener against the Pittsburgh Steelers.

"I don't want that taken out of context," Manziel said. "I can get ready. Right now, it's the second week of preseason."

Coach Mike Pettine still plans to make his starting quarterback decision Tuesday for the opener.

---The Chicago Bears agreed to a contract with veteran wide receiver Santonio Holmes, ESPN reported Saturday.

Chicago is in need of a No. 3 wide receiver with Marquess Wilson out with a fractured clavicle. The Bears have a starring duo with Brandon Marshall and Alshon Jeffery, but have not been able to find a replacement for the injured Wilson within their roster.

Holmes, 30, a former Super Bowl MVP, was limited last season while recovering from a foot injury. He made 23 catches for 456 yards with one touchdown in 11 games for the New York Jets. He played in just four games in 2012 before getting injured.

---New Orleans Saints coach Sean Payton is not happy with tight end Jimmy Graham's goal-post dunks.

Graham scored his first two touchdowns of the exhibition season in Friday night's 31-24 win over the visiting Tennessee Titans and drew unsportsmanlike conduct penalties for dunking over the goalposts. Graham's habit of dunking the ball over the goalposts after touchdowns was banned by the NFL this offseason, along with other taunting penalties where the ball is used as a prop.

After the second one Friday, an angry Payton ran Graham down on the sideline and yelled at him. The two then had an exchange.

---Philadelphia Eagles cornerback Cary Williams apologized to New England Patriots coach Bill Belichick after their exhibition game Friday night.

Earlier this month, Williams referred to the Patriots as cheaters.

"I told him I was sorry for the words that I said. That was just out of pure emotion, sometimes you say things without really thinking about them," Williams said to ESPN.com after the game, which New England won 42-35. "

---Oakland Raiders rookie quarterback Derek Carr sustained a concussion during Friday night's exhibition win over the Detroit Lions.

Carr, a second-round draft pick out of Fresno State, was tackled hard by Lions defensive end Larry Webster while rolling out of the pocket with 5:35 left in the game. Carr injured his ribs on the play. but coach Dennis Allen said he left the game because of a concussion.

Carr, competing for a backup spot to starter Matt Schaub, played a series with the first unit and five with backups. He completed 9 of 16 passes for 109 yards and a touchdown.

---New York Jets rookie wide receiver Jalen Saunders had a "medical incident" while driving to the team's practice facility Friday, police told NJ.com.

The Jets initially said that Saunders was involved in "a single-car accident" Friday morning, but police said he did not actually crash his car. The Jets said Saunders, 21, was OK but sent to a hospital as a precaution.

Florham Park Police Department Sgt. Scott Bartel would not provide further details of Saunders' incident, including where or what time it took place.

---St. Louis Rams running back Isaiah Pead was assisted off the field and carted to the locker room after he fell untouched on a kickoff return during Saturday's exhibition game against the Green Bay Packers.

Pead made a 33-yard return down the sideline when he hit the ground. The non-contact injury appeared to occur when he planted on his left foot.