Buffalo Bills safety Damar Hamlin remains hospitalized in critical condition but showed "signs of improvement" that were observed Tuesday and overnight into Wednesday, according to the team.

The Bills said Wednesday in a statement that Hamlin "is expected to remain under intensive care as his health care team continues to monitor and treat him."

Jordon Rooney, a friend and business partner of Hamlin's, told ESPN's Coley Harvey earlier Wednesday that Hamlin was still sedated at the time, less than two days after he went into cardiac arrest on the field during the Bills' game against the Cincinnati Bengals.

Rooney told Harvey that doctors saw promising readings overnight from Hamlin that they had hoped to see by Wednesday morning. Hamlin's agent, Ron Butler, told ESPN's Jeremy Fowler on Tuesday night that Hamlin's oxygen levels had improved.

Rooney's update came after Hamlin's uncle, Dorrian Glenn, told numerous media outlets Tuesday night that there were some encouraging signs in his nephew's progress, such as doctors lowering the level of oxygen Hamlin needs from 100% to 50%.

CPR was administered to Hamlin, 24, on the field Monday night for multiple minutes after he collapsed following his tackle of Bengals wide receiver Tee Higgins. Hamlin received oxygen, according to the ESPN broadcast, as he was placed in the ambulance and taken off the field some 16 minutes after he collapsed. He then was driven to the hospital.

The Bills have announced they will hold meetings and a walk-through Wednesday but will not have any media availability.

The NFL announced Tuesday that the Bills-Bengals game will not be resumed this week, and the league is undecided on resuming the game at a later date. The NFL has not made any changes to the Week 18 regular-season schedule.