The Vikings have released tight end MyCole Pruitt, as Chris Tomasson of the Pioneer Press tweets. The move will allow Minnesota to activate quarterback Taylor Heinicke. 
To date, Heinicke has spent the season on the non-football injury list after foot injury in July. Heinicke, 23, returned to practice earlier this month, starting the clock on a three-week window during which the Vikings must place him on the 53-man roster. The deadline was tomorrow, but Minnesota has decided to put him on the roster a day early. After recently waiving quarterback Joel Stave from the taxi squad, Heinicke should now have plenty of opportunities to shake off the rust in practice.
Pruitt suffered a sprained MCL late in the preseason and has been largely hampered by injuries this year. The 24-year-old has been cut after appearing in just two games this year.
Heinicke will now slot in as the No. 3 quarterback on the depth chart behind starter Sam Bradford and primary backup Shaun Hill. Meanwhile, the Vikings will now move ahead with three tight ends: starter Kyle Rudolph, Rhett Ellison, and rookie David Morgan II.