Laudruip insists he will not allow for complacency in Romania and is looking for a professional display like the goalless second leg after beating Malmo 4-0 in the previous round.
"To score five goals and win 5-1 is excellent. In the first half-hour we did very well, we kept the ball and moved them around.
"We scored three of our goals, we could have scored more, and we gave them nothing.
"I told the players at half-time we had the chance to go for a fourth goal and we did that.
"They were more offensive in the second half but we still dominated, got the fourth and a great fifth from Pozuelo.
"We still have to finish the job, after the first leg against Malmo I said we still had a job to do and that is the same here.
"We are close to another historical achievement for this club and we have to finish it.
"We have done well here, we created chances and dominated the game. We don't have to do that next week, we just need to get a result."
Wayne Routledge, who scored twice at the Liberty, believes the margin of victory could have been bigger.
"At times I think we were ruthless," Routledge said. "There were times we could have scored more but to get five at home was a nice feeling.
"At the end it got sort of into a bar fight but it was nice to have the five goals by then.
"It's nice to get on the scoresheet but it's nicer to get a result like we did tonight. It stands us in good stead for the next leg."