Johnson, who was benched for Sundays game for violating team rules, may face league punishment for a separate incident, ESPN.com reports. Sources say Johnson was involved in a physical altercation with a woman at a Kansas City nightclub during the Chiefs bye week. Recommendation: Johnson is already facing a December court date for yet another assault allegation. This the fourth alleged incident of Johnsons NFL career and the second of 2008. The past three have all involved a nightclub and a female accuser. To the NFL, that represents a disturbing pattern of behavior, and sources report that Johnson will face a league-imposed suspension for his involvement in the incidents. Its just a matter of for how long, one source said. Kolby Smith saw the bulk of the work on Sunday with Johnson out and would likely continue as the starter if Johnson is suspended. Jamaal Charles will rotate in as a change-of-pace runner.