Texans defensive tackle Nate Frees underwent arthroscopic surgery Monday on his right knee and is expected to be out six weeks, coach Gary Kubiak said Tuesday.
Frees has missed 10 games in his career because of the injury.
He is the second member of the Texans to undergo arthrodesis in less than a month after defensive end J.J. Watt had surgery in May.
Kubiak said he hoped Frees would be fully recovered by the end of the season.
Freese was selected by the Texans in the fourth round of the 2012 draft.
He was selected in the second round by the Broncos in 2013 and played in all 10 games last season, recording one tackle and one pass deflection.
He was signed to a four-year, $20 million contract extension in 2016.