Blues travel to Peterborough on Saturday to take on a team that will be buoyed by successive wins against Leicester City and Millwall.
Darren Ferguson's side beat The Foxes 2-1 at London Road before trouncing Millwall 5-1 at The Den in midweek.
That six-point haul has seen The Posh finally climb off the bottom of the table and overtake Bristol City.
Having seen Peterborough in action several times, Blues boss Clark is acutely aware of the attacking threat they pose.
"We’ve got a very difficult game against a very expansive and exciting Peterborough, so we have to go on there and take them on," he said. "I know Millwall had a man sent off, but it was still a fantastic result for them.
"I’ve always admired Peterborough and Darren’s team when he’s been there. They’ve got some magnificent attacking players. Darren has done great in the lower leagues and non-league by getting little gems out of there that have come into the Championship and done brilliantly.
"They possess a lot of pace in their side and we know they’re in for a tough game but they are as well. We know we’ve got to go at them because they’ll be going at us."
After losing heavily to Watford last Saturday, Clark's team put in a much-improved defensive display in their 0-0 draw against Sheffield Wednesday on Tuesday. That point moved Blues up to 39, some six points ahead of Saturday's hosts. It was also their first shut-out in 20 games and the Blues boss is looking for his players to use that as a springboard moving forward.
"We’ve got to be positive," he said. "I thought we put in a strong performance on Tuesday night. We were very well organised and I think if we’d taken our chances we could have got the three points, but it wasn’t to be.
"But if you can’t win it, don’t lose it. The positive to take was that we kept that elusive clean sheet and hopefully it’s something to take forward to Peterborough now. We are going to have to be at our best again defensively because they pose a great attacking threat. That’s one of the master strengths they got, they’ve got good attacking players that score lots of goals. If we do that right we can go there and win the game.
"We have proved a tough nut to crack away from home. We have put in some really good performances. We need to do that again because this is going to be tough even though they are below us in the league. They will be buoyant after their result against Millwall, because if you can't be buoyant after you've just won away 5-1 you are never going to be."
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