Redskins running back Alfred Morris with the ball during Sunday’s game against the Saints Sunday (John McDonnell/The Washington Post)

Washington Redskins coach Mike Shanahan said Monday that Alfred Morris will remain the team’s starter at running back. He expressed confidence in backups Evan Royster and Roy Helu Jr. but said Morris remains the top back for now, based on his two-touchdown performance Sunday against the New Orleans Saints.

Shanahan said rookie safety Jordan Bernstine is out for the year with torn anterior, posterior and medial collateral ligaments in his knee. The seventh-round pick out of Iowa had a strong preseason and was one of six safeties to make the roster. He contributed on special teams as well.

Shanahan said Bernstine will soon have surgery and that the team likely will bring in another safety. He said DeJon Gomes played “exceptionally well” in his start at strong safety.

Shanahan said long snapper Nick Sundberg, who played the second half of Sunday’s game with a broken arm, will not play next week. The team will bring in another long snapper this week.

Wide receiver Pierre Garcon’s injured foot remains sore. He will test it out in practice Wednesday before his availability for Sunday’s game at St. Louis is determined, Shanahan said.

Shanahan said that left guard Kory Lichtensteiger did well in his first game since tearing an ACL and MCL last October.

Shanahan said that he didn’t notice a lot of difference in the officiating of the game, which was overseen by  replacement referees. He said there were calls he disagreed with, as there are every year, and that he always sends a list to the league following games.

Shanahan said a missed blocking assignment led to the Saints’ blocked punt and touchdown, but that he was pleased with how the punt unit recovered.