Based on what exactly, other than absolutely nothing of course?
His work with Estoril taking them from the second division to 5th and then 4th in the top tier on a shoe string budget.
Winning 28/30 matches to win the league with Olympiakos.
Taking a largely talentless squad like Hull and getting them playing great football despite losing their star player (Snodgrass) and acquiring more points in his 18 matches there and 6 other premier league teams.
Made a strong start to his Watford career but let's not pretend they're a great squad who should be anything more than midtable.
He's a talented manager who has already won more than Sam Allardyce.