Welcome to another Star Tribune mailbag, answering your Vikings questions via Twitter or email. Send your questions to @Andrew_Krammer or Andrew.Krammer@startribune.com and he'll answer a few each Friday.

How are the Vikings lineman and coaches going to scheme around Aaron Donald? Does he have a weakness (like power run at him or tosses away from him) — Kyle P. Slaby (@TheBigHerman) November 14, 2017

A: “Well, it’s not easy,” Vikings head coach Mike Zimmer said this week. Rams All-Pro defensive tackle Aaron Donald is the NFL’s best interior pass rusher and likely the league’s best interior defender overall. His 53 quarterback pressures are five more than any other NFL defensive tackle, according to Pro Football Focus. The Texans tried a little of everything to slow him down in their 33-7 loss last week, and Houston was doomed as soon as they left Donald with a one-on-one pass rush. They trapped him on a run, doubled him on another. Then Tom Savage dropped back and Donald seemingly went through Texans left guard Xavier Su’a-Filo with a rip move, ending in a strip sack. “You try and get two hands on him as much as possible,” Zimmer said. “You get him on the ground as much as you can – trap him, cut him.” This will be a top test for a Vikings offense crafty at protecting the quarterback.

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Will the Vikings be able to afford to sign Keenum as a long term back up? — Brook (@MohrBrook) November 14, 2017

A: Many questions need to be answered first, including the rest of Case Keenum’s season, Teddy Bridgewater’s potential play and how an NFL desperate for quarterback play receives a free agent Keenum after the best run of his professional career. He’s 288 yards shy of his career high for a season, for which he’s already reached in touchdown passes (11) and completion percentage (64.9). The way he has played will attract bidders. So regardless if he’s priced out for the Vikings next year, would Keenum want to return as a backup? He may be the next popular ‘bridge’ quarterback for somebody. The Vikings’ situation is open with only quarterback Kyle Sloter currently under contract through next season.

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What’s the latest on Shariff Floyd? Is his career over, or will he play again? — Ted Glover (@purplebuckeye) November 14, 2017

A: The Star Tribune’s Ben Goessling reported this month the Vikings don’t think defensive tackle Sharrif Floyd will be able to resume his playing career. Floyd, on the non-football injury list with a contract that can expire in March, has not been seen around Winter Park by reporters since this summer, when he was continuing to push through rehab from nerve damage suffered during knee surgery in September 2016. Floyd said this spring he still was unable to run. It’s been a devastating turn for a talented player who had already overcome difficult circumstances to play professionally.