Foster was arrested the morning of February 11 at a home on Shannon Road in Los Gatos after the woman, who has been in a relationship with Foster for several years, flagged down a stranger's auto to get help calling 911.
Foster is accused of dragging his girlfriend by the hair and punching her in the head eight to 10 times.
Prosecutors have dropped a misdemeanor ammunition charge against San Francisco 49ers linebacker Reuben Foster, but his three felony charges for domestic violence and possessing an assault weapon remain, authorities announced Monday.
The report states that Foster will not participate in the 49ers' offseason program as the legal system takes its course.
"As previously stated, [Foster's] future with the team will be determined by the information revealed during the legal process", the Niners' statement said Sunday.
He was also charged with one misdemeanor count for possession of a large capacity ammunition magazine.
The 49ers called the domestic violence charges against Foster disturbing.More news: Allegiant Air Had More Than 100 Big Problems in 2 Years
If convicted on all charges, He faces up to 11 years in prison.
Foster, selected by the 49ers with the 31st overall pick in the first round of the 2017 NFL Draft, was charged with felony domestic violence against his live-in girlfriend on Thursday.
The San Francisco 49ers will start their offseason program on Monday, but linebacker Reuben Foster won't be there. The voluntary sessions begin with strength and conditioning, then move to on-field work with coaches and finally the so-called OTA practice sessions, which end in June. Foster didn't enter a plea at his arraignment before Santa Clara Superior Court Judge Nona Klippen at the Hall of Justice in San Jose, California, and he left the courthouse after Klippen set his bail at $75,000.
The NFL has said it is monitoring the Foster case but has made no announcement of any penalties or suspensions for the second-year player.
"We continue to monitor all developments in this matter which is under review of the personal conduct policy", the National Football League said in a statement.
The victim went to a hospital to be treated for her injuries and was released afterward, prosecutors said.
After Foster was charged last week, the Niners issued a statement saying they meant to follow the matter and noted that Foster "is aware that his place in our organization is under great scrutiny and will depend on what is learned through the legal process".