Ullmark is contending with an illness and will not be available for Sweden's game versus Team USA on Monday, according to Elliotte Friedman of Sportsnet.
Samuel Ersson will get the start in place of Ullmark at TD Garden in Boston. The Swedes will be playing for pride Monday -- the Americans will face Team Canada in the 4 Nations Face-Off Final on Thursday. Ullmark will have plenty of time to recover before the Senators resume play Saturday against Montreal.