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Indianapolis • NFL sacks champion Robert Mathis admits he made a mistake late last season.

Now it's going to cost him — four games and four paychecks.

The Colts' career sacks leader was suspended Friday by the NFL after violating the league's ban on performance-enhancing substances. What exactly Mathis tested positive for remains a mystery but the linebacker said in a statement he was seeking fertility assistance. He acknowledged that he and his wife are expecting a baby.

"I am deeply saddened that this situation will prevent me from contributing to my team for four games, and I regret that I didn't cross check what my doctor told me before I took the medication, " Mathis said.

Mathis set a single-season record with 19½ sacks last season.

The Associated Press