Alarcón had just completed a six-game suspension for violating the NFL's policy on performance-enhancing substances.
The 49ers now turn their focus to Sunday's matchup against the Atlanta Falcons at Levi's Stadium, as they look to improve on their 4-2 record and maintain their slim lead in the NFC West.
More San Francisco 49ers News
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49ers announce roster moves ahead of Week 1 clash vs. Rams
The San Francisco 49ers announced the following roster moves ahead of kickoff against the Los Angeles Rams in Melbourne, Australia. Placed on injured reserve: DT Alfred Collins Elevated from the practice squad: WR KhaDarel Hodge DE Ogbo Okoronkwo Collins suffered a... -
49ers make roster moves in Melbourne, promote veteran and waive tight end
According to the NFL transaction wire, the San Francisco 49ers made a couple of roster moves from Melbourne, Australia, on Saturday. The team signed veteran long snapper Jon Weeks from its practice squad to the active roster, making him eligible to play in Week 1 against the... -
49ers roster moves: D-lineman signed while another is placed on IR
The San Francisco 49ers have officially announced the signing of defensive lineman Khalid Kareem to a one-year deal. News of the signing was first reported by Greg Aumen of FOX Sports. To make room on the roster, the team placed defensive lineman Sam Okuayinonu on the injured... -
49ers' win over Rams leaves Sean McVay calling loss 'humbling'
The well-rested San Francisco 49ers, who arrived in Melbourne, Australia, nearly a week before their opponent, dominated the favored Los Angeles Rams in Week 1. The 49ers return to Northern California with a 1-0 record after crushing their division rival 27-7 at the iconic...