The 49ers lost Joe Staley for six to eight weeks after the starting left tackle suffered a broken fibula on Sunday against the Cincinnati Bengals.
Young, 32, was initially signed by the 49ers on August 12 after the loss of swing tackle Shon Coleman (ankle, fibula) for the season. Somewhat surprisingly, he was waived as part of the team's 53-player roster cut-down.
The Cowboys made Young a sixth-round selection out of Notre Dame in 2010. Young has 88 game appearances and 21 starts through his nine NFL seasons. He appeared in 22 games with seven starts for the Miami Dolphins over the last two seasons.
Condo, 38, is a two-time Pro Bowl selection. The Dallas Cowboys signed the long snapper as an undrafted free agent out of Maryland in 2005. He spent the majority of his career with the Oakland Raiders (2006–17) and part of last season with the Atlanta Falcons.
The Buffalo Bills signed Sanborn as an undrafted free agent out of Florida State in 2009. The 34-year-old most recently played for the Tampa Bay Buccaneers (2017-18).
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