Cook iffy for Week 4?

Vikings HC Kevin O'Connell again labeled RB Dalvin Cook (shoulder) "day-to-day" on Wednesday. O'Connell added that they're hoping to at least get Cook some work in walkthroughs this week before deciding whether he can play vs. the Saints on Sunday morning. That makes Cook sound less certain for Week 4 than previous reports. Alexander Mattison is on standby as a RB1 if Cook misses.