I have to have a look," said Preki, who added that he had not yet seen the replay.
Chivas USA skipper Claudio Suarez ripped the ensuing spot kick into the back of the net.
In stoppage time, Blanco ran into the penalty area and went down after contact with second-half substitute Alex Zotinca. When no call was made, Chicago's sideline erupted in apparent rage. The arguing cost the visitors as coach Juan Carlos Osorio was sent off.
Still, Suarez said the ball was correctly ruled to not have been a penalty.
"It was a controversial play, but I don't think it was a penalty," Suarez said. "Alex knocked the ball away cleanly even though there was contact. They argued a lot but to us who were a lot closer, we saw it wasn't."
Luis Bueno is a contributor to MLSnet.com. This story was not subject to the approval of Major League Soccer or its clubs.
