Williams, who lifted the club's first major silverware in the Capital One Cup final in February, reckons the Welsh club can hit new heights this season.
He said: "I'm really excited and I'm almost scared to admit that I think we're going to be good this season. I don't want to jinx it.
"We've progressed every year but I've never had a pre-season this good before. We've scored a lot of goals and haven't conceded many. It couldn't have gone better."