As Mortensen mentioned, with Minnesota expected to add quarterback Teddy Bridgewater to the active roster very soon, a spot on the team has to be made in order for that process to be completed.
Ironically, Bridgewater is taking the place of Sam Bradford who was placed on injured reserve with a knee injury of his own.
Bradford, acquired in a trade with the Philadelphia Eagles after Bridgewater's injury previous year, has been battling an ailing knee since leading the Vikings to a 29-19 win over the New Orleans Saints in the 2017 opener.
The Vikings activated Bridgewater (knee) from the Physically Unable to Perform list Wednesday.More news: Elliott's injunction appeal hearing set for Thursday in NY federal court
The Vikings play the Washington Redskins at FedEx Field on Sunday.
Zimmer said "no one knows" when asked if Bradford will play again. "Hopefully we'll be able to get him back when he gets healthy". When he returns to the roster, it will be initially as a backup to Case Keenum, who is 4-2 as a starter in relief of Bradford. "So we just keep going from there and see how this thing plays out".
It is unclear if or when the Vikings will turn to Bridgewater.
"I know he's going to be great when he gets his opportunity", Wright said.More news: Could Disney/Fox Talks Give Marvel X-Men & Fantastic Four Back?
Bridgewater was a full participant in practice Wednesday and declined comment afterward.
Whenever Bridgewater becomes more comfortable, he could reclaim his old starting job. He's completed 63.9 percent of his passes and thrown seven touchdowns to just three interceptions.
The Vikings believe another team would pick up Sloter if they waived him in an attempt to get him on the practice squad.More news: These are the instructions Apple should have included with the iPhone X