With zero help from his offensive line, Robert Griffin III repeatedly wound up on the turf until leaving with a concussion after being sacked three times and fumbling twice last night in the Washington Redskins' 21-17 preseason victory over the Detroit Lions in Landover, Maryland.

Griffin went 2-for-5 for 8 yards on four possessions for Washington (2-0). On his final play, early in the second quarter, he started to scramble but dropped the ball despite no contact. As the QB went to the ground to try to corral the loose ball, Lions defensive end Corey Wootton landed on Griffin.

Redskins coach Jay Gruden said Griffin had a concussion but that the QB's right shoulder, which also was hurt, would be OK. Gruden said he had "no idea" how long Griffin will be sidelined with the head injury.

For Detroit (1-1), Matthew Stafford looked good, going 6 of 8 for 78 yards and leading one scoring drive that ended with Matt Prater's 49-yard field goal.

When RG3 got hurt, he stayed down for about 5 minutes and was tended to by trainers. When Griffin eventually rose, he slowly stepped to the sideline, then kept going until he left the field.

Manziel, Manuel impress

Johnny Manziel made another strong impression on Cleveland's coaches. EJ Manuel's was even better for Buffalo.

Manziel threw a touchdown pass and maybe closed the gap on presumed starting quarterback Josh McCown before Manuel rallied the Bills to an 11-10 victory. Manuel, attempting to beat out Matt Cassel and Tyrod Taylor for Buffalo's starting job, threw a 14-yard TD pass to Andre Davis with 1:31 left. He then connected with rookie Bronson Hill for the 2-point conversion to complete a late rally by the Bills (1-1).

Cardinals lose Peters

Two of the Cardinals' most significant offseason acquisitions are injured, one of them -- starting nose tackle Corey Peters -- is lost for the season.

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Peters tore his left Achilles tendon in practice Wednesday. Starting left guard Mike Iupati, hurt Tuesday, will undergo surgery for a torn left meniscus. Coach Bruce Arians said Iupati is out three to eight weeks.

Source: Talks at standstill

Negotiations have reached a standstill in the Bills' bid to sign defensive tackle Marcell Dareus to a long-term contract, two people familiar with the talks told The Associated Press yesterday. Dareus, 25, will make just over $8 million in the final year of his contract this season. -- AP