Venric Mark will not return in the second half of Saturday's game against Michigan State because of an "upper extremity" injury, according to a Northwestern spokesperson. 

Mark was shaken up during overtime of last week's loss to Michigan. Mark had six carries for nine yards in the first half against the Spartans and also returned a punt. Mark, who has the second most kickoff returns in Wildcat history, did not return kicks, however. 

Mark entered the game ranked first in the Big Ten and sixth in the country in total yards.