Buffalo Bills safety Damar Hamlin has shown what physicians treating him are calling "remarkable improvement over the past 24 hours," the team announced Thursday, three days after the player went into cardiac arrest and had to be resuscitated on the field.

"While still critically ill, he has demonstrated that he appears to be neurologically intact," the Bills said in a statement. "His lungs continue to heal and he is making steady progress."

Bills rookie cornerback Kaiir Elam also posted a message on his Twitter account that said Hamlin "is doing better, awake and showing signs of improvement."

The developments came as the Bills were scheduled to return to practice on Thursday for the first time since Hamlin collapsed after his heart stopped after making a tackle and was rushed to the University of Cincinnati Medical Center during the first quarter of Buffalo's game against the Bengals on Monday night.

The second-year player has spent the past two days sedated and listed in critical condition.

The Bills' announcement comes as they prepare to play a home game against the New England Patriots on Sunday, and with the team still dealing with the shock of seeing their teammate collapse on the field, his heart not beating.

After returning home early Tuesday once the game was suspended, the Bills held meetings and a walkthrough practice without any media availability on Wednesday. On Thursday, players were spotted arriving at the facility, though the team has not yet released a practice schedule.

The chilling sight of Hamlin collapsing, which was broadcast to a North American TV audience on ESPN's "Monday Night Football," has led to an outpouring of support from fans and players from across the league.

Numerous players — former teammates and those who didn't know Hamlin until Monday — voiced their support, while saying they were shaken by what happened.

Colts safety Rodney Thomas made the two-hour drive from Indianapolis to Cincinnati on Tuesday just to be by the side of his former high school teammate.

"He's a fighter. I know he's a fighter and there's no other thought in my mind other than him walking out under his own power," Thomas said Wednesday.

Minnesota Vikings defensive tackle Harrison Phillips, who spent the previous four seasons playing for Buffalo, had dinner delivered to the hospital for Hamlin's family and medical staff.

Hamlin's marketing representative Jordon Rooney said Wednesday that the player's family was buoyed by the words and acts of kindness.

"They are elated right now," Rooney said. "Damar is still their first concern. But for them, they always look at how they can turn a somewhat troubling situation into a good one. The bounce back from this, for him and his family, is going to be incredible."

What remains unclear is whether the NFL will reschedule the Bills' game against the Bengals, which has major implications in determining the top spot in the AFC. The playoffs are set to open on January 14.

The Chiefs (13-3) have a half-game lead over Buffalo (12-3), with the Bills owning the tiebreaker after beating Kansas City this season. The Bengals (11-4) are currently the third seed and have also defeated the Chiefs.

Hamlin was hurt in the first quarter when he was struck squarely in the chest while making what appeared to be routine tackle of Bengals receiver Tee Higgins. Hamlin briefly got up and adjusted his facemask before collapsing backward.

Hamlin was selected by Buffalo in the sixth round of the 2021 draft out of Pitt. He spent his rookie season limited to special teams roles, and took over the starting safety job in Week 3 in place of veteran Micah Hyde, who remains sidelined by a neck injury.

Fans, team owners and players — including Tom Brady and Russell Wilson — have made donations to Hamlin's Chasing M's Foundation, which had raised more than $7 million by Thursday morning.