LAKE FOREST, Ill. — Chicago Bears coach Marc Trestman stood behind his coaching staff despite calls for the firing of defensive coordinator Mel Tucker following Sunday night’s embarrassing 55-14 loss at Green Bay.

The Bears have been outscored 94-7 in the first halves of the last three games, all losses, and the Bears became the first NFL team since 1923 to give up more than 50 points in back-to-back games.

Yet the entire coaching staff remains unscathed.

“Slow start again,” Trestman said Monday. “We’ve seen ourselves when we don’t have slow starts and we’ve had a litany of them the last three weeks and certainly that’s unacceptable.”

Coaches and players alike insisted the team went through two good weeks of practice.

“We prepared well,” defensive end Jared Allen said. “We’ve got to find a way to transfer it to game day.”

This one appeared to go beyond a shrug of the shoulders and “let’s go on to next week.”

Losing to a rival after having two weeks to prepare seemed to indicate something wrong with the way the coaching staff and team were going about their business during the week. The loss led to reports of the Bears coaching/management brain trust meeting behind closed and guarded doors in Green Bay after the game.

“We know our fans are disappointed — they have a right to be,” Trestman said. “This has been a very disturbing stretch of three weeks. There’s no doubt about it.

“We’re here focused, and the only way we can work our way out of this is to go get ready for Minnesota and to work our way out of it.”

It’s the third time in 11 games an opponent scored over 50 points on the Bears defense. In franchise history, it had been done only three other times.

Opposing quarterbacks were a combined 23-of-28 for 229 yards in the first quarters of the last three games, which could indicate a lack of preparedness by the Bears defense.

“There was confusion all night,” cornerback Tim Jennings said. “We blew some coverages on the back end starting with myself. There were some miscommunications on the back end.

“At the end of the day, we need to execute the game plan.”

After Packers quarterback Aaron Rodgers led touchdown drives on five of the Packers’ first six drives in Chicago in week 4, he did exactly the same thing in Green Bay. Then he added a sixth TD drive after a lost fumble at the 1-yard line had prevented it from being 7-for-7 Sunday night.

On the year, opposing passers have a 107.0 passer rating against the Bears defense.

Trestman remained behind Tucker as well as other defensive assistants despite the mistakes.

“I watch him (Tucker) work every day, I watch him communicate with these players, I watch him work on the field with these players,” Trestman said. “To me, he’s doing everything he can under the circumstances to coach, to teach, and to lead that side of the ball and he’s got a very good staff with him.

“They’re great teachers. They’re veteran coaches who have been in a lot of situations, as Mel has. He’s been through these types of things. I feel very confident he’s doing the things he can do to help us move forward.”

The abysmal defensive effort almost overshadowed another poor effort against Green Bay by quarterback Jay Cutler, who threw two interceptions and lost a fumble. One interception resulted in a touchdown return.

“I think we’re all searching for answers right now,” Cutler said. “As players, we need to figure this out and look inside each player and find out what’s really going on inside.”

It all led wide receiver Brandon Marshall to say it’s a team that has “lost its way.”

“I think that’s fair,” Cutler agreed. “Any time you get down like that, especially against a team you feel good about after a good week of practice and coming off a bye week and everybody’s energized and enthusiastic, that’s how you have to feel.

“There are a lot of frustrated guys in the locker room right now and frustrated coaches. The only thing we have to do is stick together and keep working, and try to get out of this hole and get things back together.”

The idea of someone losing his job over the stretch of five losses in six games didn’t surprise anyone.

“When you lose, it’s the nature of the business,” Marshall said. “Before the season it seemed like we had everyone we needed, and 3-6 is the reality of it.

“And we’re not very good.”

Notes: Tight end Martellus Bennett (ribs) played despite his status as questionable when he missed two practices late last week. He had two catches for 45 yards. . . . Guard Brian de la Puente may wind up starting at left guard for several games due to a series of injuries.

REPORT CARD VS. BENGALS

PASSING OFFENSE: F — Jay Cutler’s 68.8 passer rating was keeping with his usual paltry numbers against the Packers, and he ran his total of interceptions thrown against them to 21 with two more. His interceptions and lost fumble on a sack gave the Packers chances they didn’t really need. Brandon Marshall refused to quit and played hard into the fourth quarter, but then suffered an ankle sprain for his efforts. Five sacks allowed by an offensive line hurt by a foot injury to right tackle Jordan Mills was a season high.

RUSHING OFFENSE: F — They seemed to trail by three touchdowns before player introductions finished, and the running game quickly became folly. The run game should have been successful because the Packers ranked last in the league against the run and had outside linebacker Clay Matthews playing inside.

PASS DEFENSE: F — Every Bears safety committed some sort of horrendous blown coverage, and the cornerbacks couldn’t stay with the Packers’ Jordy Nelson or Randall Cobb beyond two or three steps for the second straight game. Confusion reigned in the nickel defense and Jared Allen’s pass rush was apparent only twice in the game. With no sacks of the starting quarterback for the second straight game, all that money spent on rebuilding the defensive line with free agents appears wasted.

RUSH DEFENSE: F — The Packers were only going to run the ball in the second half as they tried to kill clock, and still managed 87 yards then. The addition of Jeremiah Ratliff after he missed the first Packers game did not lead to plays in the backfield and tackles for loss. The Packers had no real need to run because the Bears pass defense was there for the taking all night in zone or in man.

SPECIAL TEAMS: D-minus — The only real positive from the effort came on Chris Williams’ kick return for a touchdown. Even here it was suspect as Williams only averaged 28.8 yards a return despite having a 101-yard TD. Five of their first 10 possessions started inside their own 16. Danny McCray’s matador routine while blocking for a punt led to Patrick O’Donnell failing even to get a foot on one punt attempt.

COACHING: F — It’s a good thing they had two full weeks to prepare for this because it’s hard to imagine how bad it would have been with just a week to get ready. It took 91 minutes and 50 seconds of football this year before the Bears forced a Packers punt. The 11 penalties for 163 yards indicated a complete lack of mental preparation. Mel Tucker’s scheme did not appear to be much different from that of the earlier game with Green Bay when the Bears’ secondary was only a target for Aaron Rodgers and offered nothing to deceive or pressure him. Players appeared to quit, which only falls on the coaching staff.