BEREA, Ohio — DeShone Kizer says he’s not rushing to be a starter. The Cleveland Browns may have other plans.

Cleveland’s rookie quarterback is already taking snaps with the starting offense and seems to be gaining on veterans Cody Kessler and Brock Osweiler in their competition to be the Browns’ Week 1 starter.

Kizer, who started 23 games at Notre Dame and was drafted in the second round this year, acknowledged the team has “thrown me into the fire.” Following the Browns’ first training camp practice on Thursday, Coach Hue Jackson said Kizer has improved since last month’s minicamp.

Kizer recently spent five weeks in California working with quarterback guru Tom House, picking the brains of NFL QBs Matt Ryan, Matt Stafford and Blake Bortles.

Osweiler, who is the most experienced QB in camp, has seen a difference in Kizer and called him “a tremendous quarterback … he keeps getting better and better.”

RAMS: All-Pro defensive lineman Aaron Donald has not reported to training camp, and General Manager Les Snead says the club will continue negotiations on a contract extension.

The fourth-year pro also skipped several weeks of offseason workouts while his agent worked on a new deal that would make him one of the highest-paid players in the NFL.

TRADE: Kansas City and Seattle swapped linebackers, with D.J. Alexander joining the Seahawks and Kevin Pierre-Louis being sent to the Chiefs.

Alexander was a Pro Bowl selection last season as a special teams player for the Chiefs.

Pierre-Louis, a former Boston College player, never matched his potential with the Seahawks, struggling with injuries and inconsistent performance.

TITANS: The team agreed to a multi-year extension with two-time Pro Bowl defensive tackle Jurrell Casey.

ESPN reported that Casey, who still has two years left on his current deal, received a four-year, $60.4 million extension.

Casey has played in 94 games, with 33 sacks, 41 tackles for loss and 106 quarterback pressures.

• Tennessee released offensive lineman Sebastian Tretola after he was grazed by a bullet in the leg in a July 23 incident in Arkansas.

COWBOYS: A third Dallas defensive lineman will miss the start of the season because of a suspension.

Defensive end Damontre’ Moore was suspended for the first two games for violating the league’s substance-abuse policy.

End David Irving and tackle Randy Gregory already were suspended.

BRONCOS: Outside linebacker Shane Ray is out six to eight weeks because of a torn ligament in his left wrist. He was injured Thursday but played through it and practiced again Friday with a brace. He fell on the braced wrist during one of the final drills of the day and was sent for X-rays. He’ll have surgery Saturday.