GREEN BAY, Wis. -- Mike McCarthy's assessment of his 2015 Green Bay Packers' offense hasn't changed. In fact, the Packers 11th-year head coach used essentially the same phrase on Monday -- on the eve of his team's first practice of training camp -- as he used a few days after his team's season-ending overtime playoff loss to the Arizona Cardinals six months earlier.

"Last year was not good enough," McCarthy said during his annual news conference prior to training camp. "And the numbers reflected that."

That they did.

For the season, the Packers finished 23rd in the 32-team NFL in total offense, their worst finish since 1991, when they were 24th the year before the Brett Favre-Aaron Rodgers golden age began. In the 2015 campaign, they also finished 15th in the NFL in scoring (23.0 points per game), their worst finish in that department since McCarthy's first season in 2006 (22nd, at 18.8 points). In fact, from 2007 through 2014, the Packers were never outside the top 10 in scoring.

Rodgers, meanwhile, completed a career-low 60.7 percent of his passes, and his 92.7 passer rating was the lowest of his eight-year career as the starter.

But after an offseason of study, McCarthy's theory on what ailed his team's offense doesn't seem to have changed much, either. In the aftermath of a disheartening loss to the Chicago Bears on Thanksgiving night, McCarthy pointed to a lack of attention to detail and poor fundamentals as the reason for the offense's sudden ineptitude.

"Frankly, I think too much is made of scheme. At the end of the day, it's about running your routes or defending the route or blocking your guy or getting off the block and eventually tackling the guy and getting the football," McCarthy said then. "Our issues are technique and discipline in the technique, and quit worrying so much about the plays. Just win the route or win the play called."

On Monday, McCarthy said that he and the rest of the coaching staff delved deeply into film research during the offseason and determined that the offense needed to be simplified -- and executed better.

"I think like anything in life, when it doesn't go the way you anticipate it to go, it doesn't hit the standard you're accustomed to, you have to go back and take a hard look at it, and we definitely did that," McCarthy said. "I know more times than not, my natural reaction is go back to the basics -- and that's really what we've done as an offensive staff, and I would think our players echo that.

"We need to be much better offensively in the area of fundamentals. Last year was not good enough. And the numbers reflected that. We clearly addressed that and had a chance to go back and view all the cut-ups. Those cut-ups and lessons learned will be part of our installation phase in training camp, but we need to improve on a number of things fundamentally. And that's what training camp is for."

Training camp will also be for getting wide receiver Jordy Nelson back to his pre-injury form. And while McCarthy was reluctant -- both during last season and on Monday -- to blame the season-ending knee injury Nelson suffered in an August preseason game in Pittsburgh for the team's offensive problems, there's no denying that Nelson and his 98 receptions for 1,519 yards from 2014 were sorely missed.

Twice in the past five years, both Rodgers and Nelson have been simultaneously healthy for full seasons -- in 2011, and 2014. And in both years, the Packers led the NFL in scoring; in both years, Rodgers was named the league's MVP.

While Nelson will open camp on the physically unable to perform list, he said in June that he had "nothing physically that's holding me back," which would indicate he should be activated sooner than later. And although Rodgers acknowledged during the offseason that he and Nelson will need some time to re-acclimate themselves after Nelson missed all of last season, McCarthy sounded unconcerned Monday about the two reestablishing their connection.

"I think we're all confident -- Aaron and Jordy included -- that they're going to get it back," McCarthy said.

McCarthy seemed equally confident that the offense as a whole will regain its prior mojo and that Rodgers will return to his previous form, starting with the way he reported to camp in the best shape of his career.

During the offseason, Rodgers' two closest confidants on the coaching staff -- quarterbacks coach Alex Van Pelt and associate head coach/offense Tom Clements -- predicted Rodgers would be fueled by his subpar statistical season.

"With him, it's always a competitive thing -- the expectation that he has of himself being great. And statistically, we weren't last year. And that fire that burns in him is what makes him really special," Van Pelt said. "He's going to attack this season with a new vigor to redeem himself from his statistics last year. He played some great football, there's no question. But there's definitely areas for improvement for him. We've addressed that through the scheme eval, and we're moving forward. He always has that fire to be his best self."

Rodgers is expected to address reporters on Tuesday, following the team's first practice of training camp.

"We weren't as productive as we had been in years past. Everyone realizes that," Clements said. "We still had a good record, still got in the playoffs, still won a playoff game, but everyone wants to perform better, and I think Aaron will use that as a motivational factor. And I'm looking forward to seeing how he plays this year.

"You don't actually see all the time or know all the time what he's thinking, but you know he's a competitor and he wants to be the best. He's been recognized as the best in the past, and I know that's his goal. He has a high standard for himself, and we have a high standard for him. We expect -- and I think he expects -- to play very well."