Baltimore Ravens tight end Dennis Pitta dislocated his hip in practice Saturday and will be sidelined indefinitely with what Coach John Harbaugh called “a serious injury.”

Pitta was carted off the field in Owings Mills, Md., after colliding with safety James Ihedigbo in the back of the end zone vying for a pass from Joe Flacco. He lay prone for several minutes before the cart arrived.

The Ravens begin defense of their Super Bowl title on Sept. 5 in Denver. Pitta at least will miss that game, Harbaugh said, but the severity of the injury could keep the tight end out for much longer than that.

The Ravens retweeted a story by ESPN in which a league source said Pitta would miss the entire season.

After practice, a somber Harbaugh said, “Dennis has a dislocated hip. We’ll have to take a look at that and see exactly what it is. It’s a serious injury. He is going to be out for a while.”

Late Saturday night, a Ravens official said the club had no update from doctors or Pitta.

Pitta was preparing for his fourth season with Baltimore. The 6-foot-4, 245-pounder caught 61 passes for 669 yards and seven touchdowns last season.

In the playoffs, Pitta had 14 catches for 163 yards and three scores. In his first three seasons, Pitta has 102 receptions for 1,075 yards and 10 touchdowns over 43 regular-season games.

EAGLES: Wide receiver Jeremy Maclin tore the ACL in his right knee during practice and could miss the season.

Maclin went down at the end of a noncontact drill and appeared in pain while on the ground for several minutes. He was helped onto the cart and needed assistance getting off it and going into the team’s practice facility in Philadelphia.

In other camp news, Philadelphia signed wide receiver David Ball to the 90-man roster. The 29-year-old Ball played for new Eagles Coach Chip Kelly at New Hampshire and broke Jerry Rice’s Division I-AA record for touchdown receptions. Ball spent time in training camp with the Bears and Jets in 2007-08.

Maclin is headed into his fifth season with the Eagles. He led the team with 69 catches for 857 yards and seven touchdowns last season, and the former first-round pick is in the final year of his rookie contract.

Two-time Pro Bowl wide receiver DeSean Jackson is Philadelphia’s other starter. The team has veterans Jason Avant and Riley Cooper along with several younger wideouts in camp.

Maclin has averaged 64 catches, 863 yards and six touchdowns in his first four seasons. His best year was in 2010 when he had 70 receptions for 964 yards and 10 touchdowns.

BROWNS: Offensive tackle Ryan Miller sustained a concussion during a one-on-one blocking drill at practice in Berea, Ohio.

The 6-foot-7, 320-pound Miller, who is in his second NFL season, was immobilized, strapped to a backboard and taken by ambulance to the hospital after he was hurt. He spent several hours undergoing tests before he was released from the Cleveland Clinic.

Coach Rob Chudzinski did not see how Miller got hurt, but offensive tackle Joe Thomas said it was the result of helmet-to-helmet contact.

Miller was drafted by the Browns in the fifth round in 2012 out of Colorado. He appeared in eight games as a rookie.

GIANTS: Driving a car for more than 30 minutes, standing up straight for extended periods and getting into his football stance all had the same effect on defensive end Jason Pierre-Paul last season.

It hurt, and it hurt a lot.

The 2011 all-pro disclosed he played last season in pain, and it didn’t go away until he had disk surgery on his back in June. He is not sure whether he will be ready for the season opener Sept. 8.

SEAHAWKS: Linebacker O’Brien Schofield, who was waived Friday by the Cardinals, was claimed by Seattle. He was a fourth-round pick in 2010 and started nine games at outside linebacker in 2012 before an ankle injury ended his season.

RAIDERS: Wide receiver Andre Holmes was suspended for the first four games of the season for violating the NFL policy on performance-enhancing substances. He played seven games with the Cowboys last season, catching two passes.

PANTHERS: Rookie guard Edmund Kugbila was carted to the locker room after injuring his right hamstring at practice in Spartanburg, S.C.

Coach Ron Rivera says the extent of the injury is unclear.

Kugbila, the team’s fourth-round pick out of Valdosta State, missed most of the team’s OTAs in June with a knee issue, and Rivera says it’s unclear whether the injuries are related.