I'm sure they are all good friends and meet up for the England camps. It's also just something nice you say when you join a club, " I spoke to x and he said it's great here", but that's where it ends. Footballers don't usually make transfer decisions on where their mates are. It's not like Salah will sign for some average Italian team because Lovren goes there.
Salah already had the average-Italian-team phase of his career.