“We have nothing to be complacent about ourselves, we’re only one game ahead of Melbourne and what we’ve got to do is back up that performance,” said Mark.
“That’s what we’ve got to do, that’s been the whole focus and hopefully we can do that consistently from now on.”
Mark said the club takes a lot of confidence from last week’s performance but would again struggle to stabilise the side after injuries to some of his key players, after he ruled out Roger Hayden with a hamstring complaint and Antoni Grover with a quad strain.
"I'm trying to stabilise the team, but haven’t been able to do that with a number of guys missing through injury for a number of weeks,” said Mark.
“What we are doing is bringing along some young players that are adding some spice and excitement to the group that can hopefully sustain the performance we are looking for.
"It's going to be difficult to replace the defenders and it's an area that Melbourne will look at exploiting. We will have to get the right balance of guys down there to replace them.
“Hayden gives us a lot of rebound and attack, while Grover does some big jobs for us, but the strength of our side will be guys that can play forward and back."
Josh Carr will also miss three weeks due to suspension but Des Headland looks set to return from his knee injury and the Senior Coach also earmarked Brock O'Brien and Andrew Foster as chances to play their first AFL games of the season after impressive WAFL form.
He has also not ruled out trialling the clubs tall timber combination with Robert Warnock also in the mix for selection to assist Aaron Sandilands in the ruck.
"We will have a look at the balance of having both in the team and find out how they work together, it's just whether or not we do it this week or after the break. I'd like to see them working in sync and work out a rhythm and routine with each other," said Mark.
"Aaron’s one of those players that tends to grind it out the more time he spends on the ground. The game is telling you that you need to rotate your ruckmen, but if he can continue to play like he did there's no need to take him off the ground."
