NFL

Chiefs pass rusher Justin Houston could miss start of season after knee surgery

during the preseason game at Arrowhead Stadium on August 28, 2015 in Kansas City, Missouri.,KANSAS CITY, MO - AUGUST 28: Outside linebacker Justin Houston #50 of the Kansas City Chiefs in action during the preseason game against the Tennessee Titans at Arrowhead Stadium on August 28, 2015 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images)

during the preseason game at Arrowhead Stadium on August 28, 2015 in Kansas City, Missouri.,KANSAS CITY, MO - AUGUST 28: Outside linebacker Justin Houston #50 of the Kansas City Chiefs in action during the preseason game against the Tennessee Titans at Arrowhead Stadium on August 28, 2015 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images)

The Kansas City Chiefs could be without pass-rushing linebacker Justin Houston when they begin training camp -- and perhaps when they begin the regular season.

Houston had ACL surgery in February and is expected to be sidelined 6-12 months, according to multiple reports.

#KCChiefs announce star pass-rusher Justin Houston had his knee scoped to "fix" his ACL on Feb. 15. Recovery ranges from 6-12 months. Yikes

— Ian Rapoport (@RapSheet) March 22, 2016

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Justin Houston had ACL surgery in February and rehab is expected to be six to 12 months. Trainer Rick Burkholder... https://t.co/SO8zlTeGcj

— Adam Teicher (@adamteicher) March 22, 2016

Justin Houston had his ACL "fixed" in Feb. It wasn't torn, but it wasn't functioning the way it should. He's on the road to recovery.

— BJ Kissel (@ChiefsReporter) March 22, 2016

"It's too early to be able to tell," #Chiefs coach Andy Reid on whether Justin Houston will be ready when the season begins.

— BJ Kissel (@ChiefsReporter) March 22, 2016

Houston, 27, had 7.5 sacks and two interceptions in 2015 --€“ one season after leading the league with 22 sacks. He has been named to the past four Pro Bowls and was a First Team All Pro in 2014.

However, he missed the final five regular-season games in 2015 because of a knee injury before returning for the Chiefs' two playoff games.

Earlier this month, the Chiefs re-upped with fellow pass rusher Tamba Hali, who had 6.5 sacks last season and who has 86 sacks in his 10-season NFL career.