The Polish tactician was unhappy with the way the Sounders players tried to win a free-kick at every opportunity and believes the referees need to be stronger when dealing with this sort of situation.
"You see flopping, guys falling on the pitch like they got shot," Nowak said. "We have to recognize those guys are doing this stuff and trying to take advantage of the referees and to make themselves protected.
"I expect Freddie Ljungberg to score goals," Nowak added. "He was complaining and whining on every call, trying to push the ref to give yellow cards. That is not up to his standards."
The Union played a very physical brand which Nowak defended but admitted his team lacked some efficiency in certain areas of the pitch.
"This is a men's world, and this is how the men play," he added further.
"We have to have more of a killer instinct. We must take risks with dribbling and shots from distance.
"We have a lot of work ahead."