Packers wide receiver Davante Adams was carted off the field after taking a helmet-to-hemlet during the Thursday Night Football game against the Chicago Bears.
Bears linebacker Danny Trevathan delivered the blow late in the third quarter. He was flagged for unnecessary roughness.
Adams remained on the ground for several minutes as play was stopped. As he was being carted off the field, he flashed the fans of Lambeau Field a thumbs up.
Following the game, the Packers released a statement, saying Adams was taken to a local hospital where he was being evaluated for head and neck injuries.
Ian Rapoport of NFL.com reported on Friday morning that Adams suffered a concussion and is still in the hospital.
Trevathan expressed to reporters after the game that his hit was not intentional, and he was not trying to hurt Adams.
"I'm going to reach out to him and try to send him a message," said Trevathan. "We play a physical game, but you never wish that on anybody."
Packers quarterback Aaron Rodgers exchanged a few words with Bears players, because he felt Trevathan was celebrating after the hit.
"I don't like anybody celebrating when a guy gets carted off the field," Rodgers said to ESPN. "That's kind of the message I was conveying to them."
Referee John Hussey didn't believe the hit was worth an ejection.
However, it wouldn't be too surprising to see Trevathan fined and/or possibly suspended by the NFL.
During the offseason, the NFL competition committee said illegal hits, punishable by a 15-yard penalty, are subjected to immediate ejection and/or suspension on first offense.
An NFL spokesman told Danny Graziano of ESPN that Trevathan is being reviewed for potential discipline.