NFL officials and local police said Friday night the first-time all-star was hurt in a fight that injured three men, sending two to the hospital.
One man was arrested and five others are being investigated for assault, but not Williams, police said.
When asked whether Williams was being investigated for assault, Honolulu police spokeswoman Michelle Yu said: "I would not say that."
The league said the third-year pro will be on the sideline for the Pro Bowl game Sunday and won't lose his status as a member of the NFC team. Officials say he'll be paid a full Pro Bowl share.
Redskins teammate Jammal Brown said on Twitter that Williams needed seven stitches.
"Wasn't his fault. ... He did nothing wrong," Brown said.
Williams was replaced on the NFC team by Minnesota tackle Matt Kalil, who becomes one of seven Vikings on the NFC roster.
The Pro Bowl players have been practicing in Hawaii since Wednesday for a game in jeopardy unless the quality of play improves.
The Pro Bowl appearance is marking something of a personal comeback for Williams, who was suspended four games in 2011 for testing positive multiple times for marijuana.
The 24-year-old former first-round pick in 2009 owned up to his mistake and worked to rebuild his reputation. He was elected a team captain on offense this season.