Defensive coordinator Jim Haslett and coach Mike Shanahan (John McDonnell/The Washington Post)

Defensive coordinator Jim Haslett is among Washington Redskins assistant coaches who received contract extensions during the offseason, coach Mike Shanahan said Wednesday.

Shanahan declined to reveal details of the assistants’ contracts, but people familiar with the situation said the coaches, including special teams coordinator Danny Smith, are signed through at least the 2013 season.

Haslett, who was believed to be in the last year of his deal, came under scrutiny after the Redskins struggled during a Week 2 loss to the St. Louis Rams. Some media have speculated that first-year Redskins secondary coach Raheem Morris, formerly head coach of the Tampa Bay Buccaneers, would replace Haslett as the Redskins’ defensive coordinator at the end of the season.

Smith, who has directed Washington’s special teams under three coaching regimes, has been criticized by fans after the Redskins had punts blocked in their first two games. Last season, the team had five field-goal attempts blocked.

Haslett, Smith and the other assistants are performing well, Shanahan said.

“If I didn’t feel very good about Jim and I didn’t feel very good about Danny, I wouldn’t have extended them,” Shanahan said after practice at Redskins Park. “I feel very good about those coaches. They’re excellent football coaches.”