Sunday was a brutal day for running back injuries and the worst and biggest one might have happened in the night game with the Packers at Vikings.

That’s when Adrian Peterson had to be carried off the field with an apparent right knee injury.

The team immediately ruled him out after he was hurt in the third quarter and we likely won’t know the extent of his injury until Monday morning. Fantasy owners with Peterson will likely be holding their breath until then with the hope this isn’t a season-ending injury, and you can bet Jerick McKinnon (36 percent ownership on CBS Sports) will be the most popular player on the waiver wire this week.

It was already a rough start to the season for Peterson, who had a bad game in Week 1 at Tennessee with 19 carries for 31 yards and no catches. He was having another quiet game Sunday night against the Packers with 12 carries for 19 yards and two catches for 7 yards before getting hurt.

Adrian Peterson RB / Minnesota Vikings (2016 stats)

ATT: 31YDS: 50REC: 2REC YDS: 7

We hope Peterson will be fine and able to play in Week 3 at Carolina, but Fantasy owners need to have a plan in place. We’ll likely see the Vikings go with a shared backfield of McKinnon and Matt Asiata (1 percent ownership), who is worth adding in deeper leagues, but McKinnon has the most upside of this duo.

Many Fantasy owners will likely be chasing McKinnon this week if Peterson is expected to miss an extended amount of time. Aside from Peterson, Jonathan Stewart (hamstring, ankle), Ameer Abdullah (foot), Doug Martin (hamstring), Arian Foster (groin), Thomas Rawls (leg) and Danny Woodhead (knee) all got hurt in Week 2. And Jamaal Charles (knee) and Chris Ivory (illness) were also out.

Peterson has shown an amazing ability to bounce back from injuries, notably his torn ACL in his left knee in 2011. But at 31, we hope this isn’t something that will cause an extended absence.

Just be prepared for the worst and plan to add McKinnon and possibly Asiata in the majority of leagues this week.

Source: CBS Sports Headlines / Fantasy Football Instant Injury Reaction: Down goes Adrian Peterson