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Jadeveon Clowney of the Houston Texans looks in before the snap against the Washington Redskins at Reliant Stadium 
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Houston Texans defensive end Jadeveon Clowney, the No. 1 overall pick in the 2014 NFL draft, had arthroscopic surgery on his right knee Monday and will be out four to six weeks.
The operation was performed to repair a torn meniscus sustained during Sunday’s 17-6 season-opening victory over Washington, according to the Houston Chronicle.
Clowney will be replaced by Whitney Mercilus, a first-round pick in 2012. Mercilus had 6 1/2 sacks coming off the bench as a rookie and seven as a first-time starter last season.
This is Clowney’s third injury since the Texans drafted him in May. He underwent surgery to repair a sports hernia in June, then missed the last two preseason games because of a concussion suffered during practice
