Could be Pellegrini.
I think, Benitez is among the safest Managers - he kept NCU at 10th last year with a squad that would get relegated under many other managers. Tactically, he is one of the best managers in world - at LFC, he had often better head to head against top teams, but he didn't have the squad for 38 games marathon. This year Mike Ashley played dirty with him, still I am sure Rafa will find a way to reach 40 point mark, which basically guarantees over $100mn pay cheque, and Ashley knows that. Rafa might leave on his own to a better Club, but I doubt he'll be sacked.
Mou, I am not sure. He is one of the best ever managers in club football, but he is struggling at MU for the standard set there. He is at BP 15mn/year contract till June 2020, means it'll be extremely costly sacking. Also, he has bought several players at premium, who might not fit in next manager's plan and the incumbent from the fate of his 3 predecessors will demand big transfer kitty. After all these, there is no guarantee that next man will out perform Mou. If I was a betting guy, I won't have put money on Mou being first to be sacked, in fact he might carry on till May and leave MU on mutual agreement.
Manuel Pellegrini or Mark Huges for me.
