“We probably came out too relaxed,” freshman wide receiver Ronald Johnson said. “We were really confident.” USC figures to correct that mistake in its remaining road games, and no one seems too worried about this week’s home game with lowly Stanford. But Carroll said he is worried about the Trojans’ decision-making after USC committed 16 penalties against Washington. “We’re playing so aggressive it gets us in trouble,” he said. But he also wants the Pacific-10 Conference to explain some penalties, notably a pass interference penalty on Mays where the ball appeared to be overthrown and a late hit by Shareece Wright on Huskies quarterback Jake Locker. “We’re going to turn them in. The ones on the sideline are really difficult to make,” Carroll said. “The quarterback wasn’t out of bounds. I want to hear an explanation on a number of things. But I’m not bellyaching at all about officials.” A new concern emerged Sunday when tailback Stafon Johnson’s foot was placed in a protective boot after he got stepped on at the end of the Washington game. Carroll said Johnson underwent an MRI but results were not known and Johnson appeared to have a bruise or sprain. If Johnson is unable to play, Allen Bradford and Hershel Dennis might be placed in the tailback rotation, unless C.J. Gable overcomes his chronic groin injury that caused him to miss the Washington game. Johnson outgained senior Chauncey Washington by 16 yards despite getting seven less carries, but Carroll said he did not regret the distribution of carries. “I don’t think (it’s a problem), no,” Carroll said. And what happened to highly regarded freshman tailback Joe McKnight, who barely played after supposedly working his way into the offense last week? McKnight had no carries and had one incomplete pass thrown to him. “We just didn’t get into a rhythm of playing with him,” Carroll said. Carroll also wasn’t sure how long USC’s injured offensive linemen would be out. An MRI revealed starting guard Chilo Rachal sprained the medial collateral ligament in his knee. Carroll said starting center Kris O’Dowd would be probably be out at least two to three weeks, but Carroll was still waiting to hear from team doctors. Carroll said Wright is also expected to be out two weeks with a strained hamstring. USC will not move any players to the offensive line or to cornerback, Carroll said. Note: Besides dropping in The Associated Press poll, USC dropped from first to fifth in the Sagarin ratings, which are used to help determine the Bowl Championship Series rankings. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! “We know now we can be beaten,” safety Taylor Mays said. “These are the games where top teams slip up and it turns out to be their loss of the season.” The Trojans (4-0, 2-0 Pacific-10 Conference) also lost something else: A portion of their No. 1 ranking, as LSU leapfrogged USC in The Associated Press poll. USC remains No. 1 in the coaches’ poll. USC coach Pete Carroll’s policy is to ignore all polls, but even he conceded it was understandable if the Trojans slipped in the voters’ eyes. “It has no bearing on anything,” Carroll said. “It didn’t before or now. But the reason it would happen is because of the way we played.” When the season started, USC’s road trip to Washington looked like one of its easier games, especially with trips to No. 3 California, No. 14 Oregon and No.18 Arizona State looming ahead. COLLEGE FOOTBALL: USC has Johnson’s injury, penalties to worry about. By Scott Wolf STAFF WRITER USC’s standards plunged Saturday, when the best rationalization the Trojans could muster after barely beating Washington was that at least they didn’t repeat last year’s loss to Oregon State.