The San Francisco 49ers announced two roster moves on Monday, a day after their 30-19 loss to the Tampa Bay Buccaneers.
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.
Author's summary: 49ers make roster moves after loss.