I think it's always a safer bet getting someone that has done it in the Premier League already. We know that the Premier League is the best league in the world by miles. To have a player that's capable of making and scoring goals who's proven is a lot safer.
Any new manager who takes over won't likely want to lose Salah right away. They would be losing a large share of their league goal contributions, but after seven years with the team, they will need to get ready for his inevitable exit.
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