Omenihu was booked at the Santa Clara County jail and was released after he posted bail. Omenihu was also served with a restraining order.
Police arrived at a residence at 4:39 p.m. local time after a woman called to report that Omenihu, who is her boyfriend, pushed her to the ground during an argument. No visible injuries were observed on the woman, and she declined medical attention, police said.
The case will be submitted to the Santa Clara County District Attorney’s Office for possible charges.
“We are aware of the matter involving Charles Omenihu and are in the process of gathering further information,” the 49ers said in a statement.
Omenihu, 25, is a key member of the team’s defensive line and has 4.5 sacks this season.
The 49ers will visit the Philadelphia Eagles on Sunday in the NFC Championship Game.