Harbaugh told The Baltimore Sun Jones appeared "fine" when he reported for practice and knee rehabilitation work Monday but indicated he wasn't pleased with an alleged fight on a bus in Washington following a birthday party for Ravens' left tackle Bryant McKinnie.
The incident was first reported by celebrity news website TMZ.com.
"I'm not very impressed personally with the report," Harbaugh said. "It's not something we want to be known for. I'd like to think it's not something that those guys would want to be known for. It's nothing to be proud of. I'm kind of disappointed in that sense."
TMZ reported eyewitnesses as saying Jones was struck on the head with a bottle during the incident, which left him "bleeding everywhere."
A Washington D.C. police spokeswoman said officers responded to the scene but an unnamed injured person "refused medical treatment on the scene and refused to go to the hospital."
Jones' agent, Kennard McGuire, told the newspaper "contrary to reports, Jacoby is fine ... and was back at practice this morning with his normal rehab routine."