Mike Zimmer

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FILE- In this Dec. 11, 2016, file photo, Minnesota Vikings head coach Mike Zimmer wears an eye patch over his right eye during the first half of an NFL football game against the Jacksonville Jaguars in Jacksonville, Fla. Zimmer says he is not going to let the lingering eye issues that caused him to miss practice this week shorten his career. He was told by the team to head home to his ranch in Kentucky this week and skip the team’s voluntary practices to reduce the stress on a right eye that has had eight surgeries. (AP Photo/Phelan M. Ebenhack, File)

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FILE - In this Dec. 11, 2016, file photo, Minnesota Vikings head coach Mike Zimmer stands for the singing of the national anthem prior to an NFL football game against the Jacksonville Jaguars, in Jacksonville, Fla. Zimmer will be taking some time away from the team to recover from multiple eye surgeries. The Vikings say Zimmer is expected to return “in a few weeks.”Zimmer has undergone eight surgeries on his right eye, where he suffered a detached retina, since Nov. 1. (AP Photo/Phelan M. Ebenhack)

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FILE - In this Sunday, Jan. 1, 2017, file photo, Minnesota Vikings head coach Mike Zimmer directs his team during the first half of an NFL football game against the Chicago Bears in Minneapolis. Zimmer watched his team surrender the NFC North title back to rival Green Bay and squander a 5-0 start, putting the pressure on the 60-year-old to steer the team back into the playoffs next season. (AP Photo/Andy Clayton-King, File)

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FILE - In this Dec. 18, 2016, file photo Minnesota Vikings head coach Mike Zimmer pauses while speaking to the media following an NFL football game against the Indianapolis Colts in Minneapolis. Given a contract extension the day before training camp began and the architect of a team that started 5-0, Zimmer watched his Vikings unravel after that. Now they're eliminated from playoff contention, with one meaningless game left(AP Photo/Charlie Neibergall, File)

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Vikings head coach Mike Zimmer stands on the sideline in the fourth quarter of an NFL football game Sunday, Sept. 25, 2016, in Charlotte, N.C. (Carlos Gonzalez/Star Tribune via AP)

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Minnesota Vikings offensive coordinator Norv Turner, left, and head coach Mike Zimmer watch practice at an NFL football training camp on the campus of Minnesota State University Monday, July 27, 2015, in Mankato, Minn. (AP Photo/Charles Rex Arbogast)

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Minnesota Vikings head coach Mike Zimmer against the Tampa Bay Buccaneers during the second quarter of an NFL football game Sunday, Oct. 26, 2014 in Tampa, Fla. (AP Photo/Steve Nesius)

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Minnesota Vikings head coach Mike Zimmer watches at an NFL organized team activity at the Vikings football practice facility in Eden Prairie, Minn., Thursday, May 29, 2014.(AP Photo/Andy Clayton-King)

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Minnesota Vikings linebacker Mike Zimmer participates in a scrimmage during an NFL organized team activity at the Vikings football practice facility in Eden Prairie, Minn., Thursday, May 29, 2014. Zimmer may get more respect in the Vikings locker room than any undrafted second-year player has ever had. That's because he has the same name as the team's new head coach, but he's not related. (AP Photo/Andy Clayton-King)

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Minnesota Vikings linebacker Mike Zimmer looks on during an NFL organized team activity at the Vikings football practice facility in Eden Prairie, Minn., Thursday, May 29, 2014. Zimmer may get more respect in the Vikings locker room than any undrafted second-year player has ever had. That's because he has the same name as the team's new head coach, but he's not related..(AP Photo/Andy Clayton-King)

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Minnesota Vikings coach Mike Zimmer talks with defensive end Scott Crichton during the NFL football team's minicamp in Eden Prairie, Minn., Friday, May 16, 2014. Zimmer set to work getting young players like quarterback Teddy Bridgewater, linebacker Anthony Barr and defensive backs Antone Exum and Kendall James up to speed on what will be expected of them in the NFL. (AP Photo/Ann Heisenfelt)