At his press conference on Friday, Vikings' head coach Mike Zimmer also announced that three of the Vikings' draftees will miss the team's Organized Team Activities in May and June. Those three players are first-round pick Anthony Barr, third-round pick Scott Crichton, and fifth-round pick David Yankey. The reason for that is that their schools (UCLA, Oregon State, and Stanford, respectively) are on a "quarter" system for classes rather than the traditional semester system, and they don't break for the summer until much later in the year.
Per NFL rules, players that are drafted can not participate in team workouts until their school's academic calendar is complete. Schools that are on the semester system are basically finished already, while those on the quarter system will not be done for another few weeks.
So, those three players will miss a little bit of time with the Vikings, but Zimmer assured reporters at Winter Park today that the team had a plan to keep them caught up on everything that's happening at camp.
It doesn't appear that there are going to be any issues with any of the other Vikings' draftees and their attendance at OTAs, which is nice.