Williams insists they will start climbing the Premier League table sooner rather than later.
"I'm concerned. I don't think we've hit the level where we were last season and it's something we've got to work towards," he said.
"I've been out for a few weeks and I've had the chance to see it from the outside and... I don't think we've really got to where we need to be.
"I remember a period last season - September or October maybe - where we weren't playing too well and then we turned it around with some big wins.
"We've been here before and we need to just work through it."
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