Millwall midfielder Ryan Tunnicliffe is wary of Birmingham’s threat under new boss Steve Cotterill.

Cotterill replaced Harry Redknapp in the Blues hotseat last month and won his first game in charge against Championship high-flyers Cardiff.

And the former Bristol City manager will look to continue Birmingham’s revival by inflicting a third successive defeat on Millwall.

Tunnicliffe, who is enjoying a run in the team due to a serious knee injury to Shaun Williams, wants the Lions to take their chances at the Den on Saturday.

He said: “Birmingham are a big, physical side who like to compete.

"We need to match them because that's how we play as well. When a new manager comes in it puts a spring in everyone's step, so they'll be trying to impress him and that will make it doubly difficult.

"But we just need to get back to what we're good at. It's a different way of football to what I've been used to in the past but when you get it right it works.

“If we're solid at the back we will score goals because of the way we play. It's just about taking your chances.”