I must admit that I had never heard of Pellegrino before his appointment but now that I have seen his record it does give cause for concern.
This from today's Times:
A look at Pellegrino’s previous record makes you wonder where Southampton saw those qualities in him. At Alavés, his previous club, they averaged 1.15 goals a game, and although the team finished ninth in La Liga, no side in the top 16 scored fewer. At Estudiantes, where he spent two years in Argentina, the club averaged 1.04 goals a game. In Pellegrino’s first managerial job, at Valencia, he lasted 14 league games, during which time the team netted 18 goals; in the remaining 24 games of that season, they racked up 49. All of which does not make Pellegrino an obvious choice for a club seeking a manager to take the handbrake off.
https://www.thetimes.co.uk/article/pressure-grows-on-southamptons-mauricio-pellegrino-in-pursuit-of-exciting-brand-zdmtsdt86 (paywall)