Suh was fined $31,500 last week for a hit on Cleveland Browns quarterback Brandon Weeden. Suh, who already has been fined twice this season for hits, was suspended for two games in 2011 and fined seven times in his career.
"We don't want to make it specific about him, but you're always talking to your players about maintaining your focus," coach Jason Garrett said. "Getting locked in on the task at hand and not getting caught up in those kind of things."
Suh, who has 11 tackles and a half a sack in his career against the Cowboys, has voiced frustration with the league regarding his conduct on the field.
"There's always going to be a microscope on me," Suh said last week. "I think there's been a microscope on me since I was first drafted in 2010 because I was a first-round pick. But I think there is always going to be a microscope on me no matter where it is, from outside media, from the NFL to little kids to anybody."