Brown (ankle/knee) was not present during the media-viewing portion of Thursday's practice, Mike Reiss of ESPN.com reports.
Brown looks to be trending in the wrong direction after being listed as a limited participant at Wednesday's practice. He has caught just six of 16 targets for 75 yards in two games since returning from a stint on IR due to an ankle injury. Brown's activity level Friday could be pivotal for his availability Sunday against the Dolphins.