Brown was hospitalized Sunday after air entered his bloodstream during a pregame IV ahead of the Raiders' Week 8 matchup against the Cleveland Browns.
"Very glad to report he is up and seems to be doing well," Raiders head coach Jon Gruden on Monday. "I want to really thank our medical staff, what a job they did in an emergency situation and we're just happy he's up and around and once we get the official word as to what's wrong with Trent we'll let you know."
Raiders quarterback Derek Carr spoke about the scene in the locker room.
"Honestly, I'm human, I got a little scared for Trent," Carr said. "All of a sudden, we come in and they're wheeling him out and I'm like, bro, what is going on? It was crazy and so we prayed. As a team we prayed for him, we made sure he was OK, his family, because I'm sure they were scared to death."
The NFL Players Association is launching an investigation into the medical procedure that resulted in Brown being hospitalized, according to Adam Hill of the Las Vegas Review-Journal.
The Raiders activated Brown from the reserve/COVID-19 list prior to the contest. He's in his second season with the team after signing a $66-million deal in 2019.
Gruden didn't provide a timeline for Brown's return.
"We don't know, really, anything about Trent's status," he said. "The most important thing is that we find out what went wrong. But his availability and his status is not up for discussion right now, as far as we're concerned."