DAVIE, Fla. -

Miami Dolphins guard Richie Incognito says there's validity to complaints of dirty play by him -- five years ago.

As for Sunday's game, Incognito says he's innocent of wrongdoing.

Following the Dolphins' loss at Houston, Texans defensive end Antonio Smith said Incognito played dirty by illegally going for the legs of opposing players and hitting after the whistle. Smith said Incognito even tried to twist and break his ankle.

Incognito, who began his NFL career with St. Louis in 2006-09 before joining the Dolphins, has long heard such complaints and said he doesn't mind them.

He had a rough game Sunday, committing two holding penalties as Miami lost 30-10. But while Incognito could have played better, he said he didn't play dirty.