#4 Ronald Koeman
A lot was expected of Ronald Koeman when he was rewarded with a hefty purse in the summer ahead of the 2017/18 campaign with Everton. Koeman was not shy of letting the purse strings loose on the players he believed could propel the Toffees into new heights.
However, things did not go according to the script and he was sacked just 496 days into his new job as Everton failed to muster the desired results in the beginning of the campaign. The reasons behind Koeman's failure can be narrowed down into a few including poor transfer activity and the added weight of expectations due to the splurge of cash.
A job with the Hornets might fit the bill perfectly for the Dutchman who could do well with the kind of ambition that is required at a club like Watford to try and regain some of his lost glory.