The 24-year-old sustained multiple facial and nasal fractures. He will start the season on the disabled list, manager Craig Counsell said.
Counsell visited Liriano in the hospital. Later, Liriano joined the Brewers at the ballpark before they played the Los Angeles Angels.
"He got to see everybody," Counsell said. "It was good. I'm glad everybody was able to say hi to him and see that he was OK."
Counsell said it was too early to say how serious the injuries were and whether surgery would be required.
"Obviously, there's a lot of swelling right now," he said. "He'll have more consults with doctors in the next two or three days."
"Not everything is OK," he said. "We're still less than 24 hours out, but it was great to see him. But he's got a long road ahead of him still."
Liriano had been in the mix to start the season in center field for the rebuilding Brewers. He has appeared in 12 games for Milwaukee, and he went 4-for-25 with a double, triple and two RBIs.
He made his major league debut with San Diego in 2014. He spent last year in the minors, then was traded to Milwaukee.