AuburnSports.com, Inside the Auburn Tigers and AuburnUndercover.com reported the news first.
Sigler, a 6-foot-4, 250-pound recruit, played outside linebacker in B.C. Rain's 3-4 scheme but expects to be a defensive end at the college level.
He picked Auburn over Mississippi State and LSU.
Rivals and Scout both list him as a three-star recruit. Rivals has him as the No. 64 outside linebacker in the country, while Scout ranks him as the No. 44 defensive end.
Sigler is Auburn's 20th commitment for 2011. The Tigers could get another this afternoon when Lake Worth, Fla., running back Tre Mason makes his announcement. The South Florida Sun-Sentinel says Mason-to-Auburn is already a done deal.