5 managers who could be fired next

The postseason hasn't even begun, yet three teams have already separated themselves from their longtime bench bosses.

The Chicago White Sox replaced Robin Ventura with Rick Renteria after five seasons at the helm, while the Colorado Rockies parted ways with Walt Weiss following four underperforming seasons in charge. The Arizona Diamondbacks then topped off the madness Monday when they dismissed skipper Chip Hale.

Here are five more managers who might also be on their way out before the 2017 season:

Pete Mackanin, Philadelphia Phillies

The Phillies will look very different next season, as veteran first baseman Ryan Howard - and his monstrous $125-million contract - will be off the books as the club will exercise its $10-million buyout for 2017. With the Phillies looking to usher in a new youth movement and continue the rebuild, the club's front office could opt to part with manager Pete Mackanin, who mustered a 108-142 record in two seasons in the City of Brotherly Love.

Brian Snitker, Atlanta Braves

Though expectations were tame at the beginning of the season for the rebuilding Braves, the club ended the year as one of the hottest teams in baseball. Snitker, however, was never able to shake off his "interim" tag after taking over for the fired Fredi Gonzalez in May. Atlanta will look to keep their momentum going into next season with someone else at the helm, as the club has already approached former skippers Bud Black and Ron Washington as possible candidates for the position.

Clint Hurdle, Pittsburgh Pirates

Hurdle is signed through 2017, with a club option for 2018, and though general manager Neal Huntington has said he isn't planning any alterations to the coaching staff, Hurdle could be nearing the exit door as the Pirates may elect to start over. The team missed the postseason for the first time since 2012, and with star outfielder Andrew McCutchen reportedly on the trading block, a new, younger era could be on the horizon for Pittsburgh.

Brad Ausmus, Detroit Tigers

After signing starter Jordan Zimmermann in free agency, the Tigers entered 2016 with the third-highest payroll in MLB, behind the Los Angeles Dodgers and New York Yankees, but ultimately fell short and have nothing to show for it. Detroit's postseason hopes were out of their hands by the final game of the season, resulting in two consecutive underwhelming seasons in charge for Ausmus, which may be enough for the front office to opt for a managerial change.

John Gibbons, Toronto Blue Jays

Despite boasting one of the most offensively talented lineups in baseball, the Blue Jays nearly experienced a late collapse in September that saw the club lose the top spot in the AL East and settle for a wild-card spot instead. While Gibbons - who was hired by former general manager Alex Anthopoulos - did lead the club to its first postseason appearance in 20 years last season, 2016 hasn't gone as smoothly, with the manager's eight ejections leading the way in MLB. With a new regime in Mark Shapiro and Ross Atkins, it may take at least a World Series appearance for Gibbons to retain his spot in the dugout for next season.