Each NFL team is allowed to host 30 players on pre-draft visits. That is aside from the local pro day the team is hosting today in Alameda or the private workouts they have at college pro days.
These pre-draft visits are by far the most intense meeting any of these players will have in their long process leading up to the draft. Often times you see players who have character questions and medical questions but who are an intriguing talent. Sometimes it’s just top players who the team doesn’t dare consider using the fourth overall pick on until they get a close look at them.