WLUK-TV showed a clip of the play:
According to Rapoport, Matthews is believed to have suffered a broken nose and is undergoing a full examination by doctors.
Matthews thanked fans for their well wishes:
Packers wide receiver Davante Adams was also playing in the game and told the crowd Matthews wasn't seriously hurt.
"I wanted to let everybody know Clay is all right," Adams said, per Kelly Price of NBC26. "He's got a little boo-boo on his nose, but he'll be all right. He's a tough guy."
The softball game has become an annual tradition for Packers fans.