Ventrone only played eight games this season for San Francisco and recorded just three tackles.
Holliday was waived in Week 9 from the Buccaneers to promote Marcus Thigpen.
Replacement Joe Looney and the rest of the offensive line played well in Boone's absence as San Fran averaged 5.1 yards per carry and allowed one sack.
He's been a starter since the start of the 2012 season.
"I’m approaching training camp as a time to compete and get better, and I want to show the coaches I’m getting better every day," Looney said. "Alex Boone is a hell of a player and a hell of a guy, and him being gone is his business. But watching him on film every day, I want to come in and do a hell of a job like he does."
Coach Jim Harbaugh praised Looney's performance so far.
|Bye: Week 1|
|Bye: Week 2|
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|Bye: Week 12|
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|Bye: Week 15|
|Bye: Week 16|
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|2013||San Francisco 49ers||16||4||4.0||0||0||0||0||0.0||0||0||0|
|2014||San Francisco 49ers||15||0||0.0||0||0||0||0||0.0||0||0||0|
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