INDIANAPOLIS -- Colts linebacker Robert Mathis said if he could do it over again, he would have checked before taking a substance banned by the NFL.

But he knows he can't redo the situation. That's why he's accepted his four-game suspension for violating the league's drug policy.

"It's been a long process," Mathis said at the team's facility Wednesday. "It kind of ran its course, and all I could do is accept it."

The suspension has taken several twists and turns since it was announced by the NFL on May 16.

The pass-rush specialist used the drug Clomid, which is prohibited by the league, with the sole purpose of helping him and his wife have a baby. Mathis claims he relied on an urologist's advice on taking the drug.

Steven Morganstern, the urologist who prescribed the drug, told ESPN earlier this week that Mathis took the drug only for fertility purposes.

Morganstern also said he didn't know Mathis was an NFL player.