Buffalo Bills defensive end Mario Williams is in the first season of a $100 million contract, but he still has issues with the way he left his former team, the Houston Texans.
Williams' contract made him the highest-paid defensive player in NFL history.
He will play the Texans for the first time on Sunday when the Bills come to Reliant Stadium.
"I didn't want to enter free agency in the first place, but it was a one-way door given to me by the GM to leave Houston, " Williams told FOX 26 Sports. "I want the fans there to know entering free agency was not my decision."
Texans general manager Rick Smith declined comment for this story.
"I'm definitely excited about coming back to the place where it all began," Williams said. "I have the opportunity to play against the team that originally drafted me.
"The way things ended, I definitely feel like it was kind of a rough and all-of-the-sudden goodbye. There's some things that I'm definitely uneasy about, the final decision making that happened there. It was just the way it was handled.
"At the end of the day I'm just extremely excited to be able to be in this position and come back and play."
Williams acknowledged it will be weird walking into Reliant Stadium on Sunday.
"Yea, honestly I've never even seen the (visitors) locker room, after all the years I had been there," Williams said. "I wouldn't say it's emotional.
"I still live there (offseason). I still have obviously great friends there as far as players and even coaches. I think it's just excitement to be able to come back and face the team and they're doing well."
Williams is aware of the fact that Texans defensive end Antonio Smith has gone public with his goal of trying to have some fun with him this week by getting under his skin.
"He's been trying, but honestly if I can't get riled up by myself I'm not in the right business, especially in this position coming back and playing against the team that I started off with.
"Antonio is always picking and prodding. He's definitely trying to add fuel to the fire, but nothing is going to add more fuel to the fire than myself and the help of, I'll guess I'll say, a select few people who run their mouth and talk crap.
"The one thing that I enjoy and that I look forward to is people adding fuel to the fire. So I welcome all the newcomers as far as jumping on the bandwagon."
And Williams said he is not concerned with how Texans fans respond to him during the game.
"I really don't care," Williams said. "I really don't pay too much attention to that, besides the fact I definitely appreciate the support and I also appreciate the hate."