THE return to full fitness of Lee Martin has helped Millwall press their opponents higher up the field, according to boss Ian Holloway.
Holloway also hailed Scott McDonald's work rate in midfield and said his closing down and tracking back is crucial to the Lions' style of play.
Millwall unsettled Cardiff in a 1-0 win last weekend, getting in the visitors' faces and denying them time on the ball.
And Holloway believes Martin's return to the side after a knee injury has given the Lions an added bite.
"Lee gives us that," Holloway said. "He understands where I need him to go. McDonald also understands that too.
"McDonald has been a revelation – the way he has played, worked and enjoyed himself is totally different.
"All he needs is a couple more goals and then to me he'd be back to being as good as he was at Celtic.
"I've got to get that understanding into Aiden O'Brien, Fred Onyedinma or whoever plays there.
"First of all they have to be able to run – Fred came off the bench at Wigan and he forgot to run! He stood still and you can't do that.
"As long as I get everybody running, then we'll be able to press like that. So if Magaye Gueye hasn't been fit enough, then he can't play.
"I have brought a couple people in [on trial] over the last month to have a look at them and they haven't been fit enough to run yet.
"People don't realise the work I have had to do to get this time closing down like we did against Cardiff.
"Danny Shittu did it well in his first game back – look at where he was, how high up he was, compared to last year.
"In my first game against Huddersfield, we never got up the field."