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As for head coaches who are probably safe this season but could still find themselves unemployed if things go terribly wrong in the coming weeks and months...

Doug Marrone, Jacksonville Jaguars: They're off to a good start, but Marrone's Jags will have to finish strong as well. Another season with five or fewer wins could pave the way for yet another coaching change in Jacksonville.

Mike Mularkey, Tennessee Titans: His contract expires after the 2018 season, so if the inconsistent Titans fail to miss the playoffs (they're 3-3 right now), he could be let go. Mularkey has a 14-17 record in two-and-a-half seasons in Tennessee.

Jay Gruden, Washington Redskins: Yes, they signed him to a two-year extension in March. But if the Redskins fail to win a playoff game for the fourth consecutive year under Gruden and decide to pursue a fresh start with quarterback Kirk Cousins' future up in the air, they could cut bait and bring in a new head coach. It's unlikely considering he's under contract through 2020, but it's a possibility with owner Dan Snyder in charge.

John Harbaugh, Baltimore Ravens: The Ravens, who haven't made the playoffs since 2014, have lost three of four after a 2-0 start. Baltimore wouldn't can Harbaugh while still in contention in the jumbled AFC, but a shake-up could be in order if the team fails to earn a postseason berth for the third straight year.

Dirk Koetter, Tampa Bay Buccaneers: Expectations were high in Tampa headed into the 2017 season, but the Bucs are off to a rough start on both sides of the ball. They've lost three of five, with their last win coming by a mere two points against the 1-5 Giants.

Kyle Shanahan, San Francisco 49ers: The Niners are probably the best 0-6 team in NFL history, having lost a record five consecutive games by three or fewer points. That said, they're still without a victory, and if they lose their next 10, Shanahan could be a one-and-done head coach in San Francisco.

Anthony Lynn, Los Angeles Chargers: The Bolts are likely to give Lynn more than a year to get the franchise on track. But he has a talented team that continues to find ways to lose, and the front office probably doesn't have much patience considering the state of that nomadic franchise.