Eddie Lacy is back after another concussion, and he is pondering a couple of changes.

The bruising Green Bay Packers running back returned to practice Thursday as a full participant after getting knocked out of last week’s loss to Seattle in the season opener. He appears ready to assume his normal workload in Sunday’s home opener against the New York Jets.

It was Lacy’s second concussion in nearly a year, enough to get him thinking about adjusting his running style.

“Somehow I’ll have to figure out a way to change the way I run, but still keep the physical part of it,” Lacy said. “It’s not really something I’m trying to change as of now. I guess as I get older I will figure out how it goes.”

The second change appears to be more immediate.

Starting in training camp, Lacy had been wearing a new helmet designed to better safeguard against concussions.

“That’s what we all thought,” Lacy said.

He’s switching to his old helmet on Friday.

“I tried it out, and I think I’ll go back,” Lacy said.

The 2013 Offensive Rookie of the Year said he never had a concussion before suffering one against the Redskins on Sept. 15, 2013.

Luck tries to make amends

Andrew Luck studies the sport of football incessantly.

When something works, he wants to know why. When something fails, he scours game tape to find a solution. And when Luck makes a mistake, well, he quickly takes the blame.

Five days after rushing his offense to the line of scrimmage and calling an ill-advised quarterback sneak on fourth-and-goal from the Denver 1-yard line, Indy’s third-year quarterback didn’t change his assessment of what he described earlier this week as a poor play call.

“It’s still a stupid decision, and it will remain so for perpetuity,” Luck said, drawing laughter from a crowd of reporters huddled around his locker Thursday.

Luck contends he should have been smart enough to realize the Broncos loaded up against the run and that the Colts (0-1) didn’t have the right personnel on the field to execute it.

Gronk ready for Game 2

. — Rob Gronkowski looks to be in midseason form, at least when he’s spiking the ball after a touchdown.

The rest of his game might take a while to get there.

The New England Patriots star tight end pounded the ball to the ground after catching Tom Brady’s 6-yard pass in the season opener following knee surgery in January.

“Just a little warmup, that’s all,” he said of his windup and slam midway through the second quarter last Sunday. “Hopefully, some (more) come versus the Minnesota Vikings.”

The Patriots visit the Vikings on Sunday, hoping to do better on the road than they did a week earlier in a 33-20 loss to the Miami Dolphins.

The knee injury sidelined Gronkowski for the last five games last season, including two in the playoffs. He sat out all four preseason games while gradually increasing his workload in training camp. Then he played 38 of New England’s 86 offensive snaps in Miami, according to ProFootballFocus.com.