NASHVILLE, Tenn. (AP) - Gregg Williams thanked NFL Commissioner Roger Goodell for reinstating him back to the league, and he also is apologizing while taking ``full responsibility'' for his role in the New Orleans' bounty scandal.

The NFL reinstated Williams on Thursday morning, and the Tennessee Titans hired him as a senior defensive assistant.

Speaking at a news conference, Williams says he's here to work tirelessly for the Titans and to make a positive impact. He says he's grateful for the opportunity.

The league issued a statement saying that Goodell cited several reasons for reinstating Williams including that Williams accepted responsibility for his role in the bounty program, his commitment to never be involved in any pay for performance system and pledging to teach safe play and respect for the rules.