Michael Johnson's arrest on cocaine charges had little effect on his teammates as they marched to a 37-point victory over Sydney, but coach Mark Harvey is still quite jumpy about the affair.

Harvey stormed out of his post-match press conference in response to questions about Johnson, cutting short an appearance that had been largely devoted to more positive dialogue about the Dockers' unflappable response to a week of turmoil.

Asked whether Johnson had a cocaine addiction, among other queries, Harvey quickly became riled and marched out.

"I'm not here to talk about that, we've moved on," he said.

"I don't need to speak about that, I actually don't need to speak about it, what's been said and done has been done by the football club ... that's it, thanks."

Earlier, Harvey had been able to laud his club for not becoming flustered by Johnson, injuries and a testing travel schedule, defying the flaky Dockers image of old.

"It wasn't a distraction," said Harvey.

"People can speculate as much as they like, but it wasn't because basically we had a five or 10 minute meeting about it and then we were all focused about getting on the road to Sydney and doing what we have pretty well, winning.

"We've played three games in 14 days, we've had to make some significant changes throughout the course of the week just to make sure our players were ready for it.

"We've won on the road and it's something we haven't been renowned for doing, we've done it three times now so that's significant moving forward so that's how we see it."

He also offered a strong character reference for Johnson.

"If you know the person, if you guys don't he's got great character," he said.

Swans coach Paul Roos admired what he had seen.

"They're impressive," he said.

"Mark's got them playing really good footy, they out-tackled us 97-76 which is a really good effort, and that's where the game was won and lost.

"They were a lot harder at the man and harder at the ball, and wanted it a lot more than our guys did in the first half and then they put a big enough gap on us that when we did come in the second half we just couldn't get there."

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