Guard Amini Silatolu, who played high school football in Tracy, is visiting the 49ers today, a league source said.
Silatolu, 27, is a former second-round draft pick who has started 28 games for the Panthers and whose athleticism presumably would make him a good fit for new 49ers coach Chip Kelly's zone-blocking scheme.
Silatolu, however, tore his left ACL in November and will be out of action until training camp. He tore the right ACL in 2013.
The 49ers took a long look at Silatolu before the 2012 draft, and he met with then-offensive line coach Mike Solari that spring. The 49ers ended up selecting receiver A.J. Jenkins with the 30th overall pick that year; the Panthers took Silatolu with the 40th overall pick.
He also has had free-agent visits with the Seahawks and Cardinals this year.
Silatolu attended West Tracy High school before playing at San Joaquin Delta College and then Midwestern State in Texas. News of the 49ers' interest first was reported by CSN Bay Area.