My tuppence worth is:
IF SEVCO approached us, Milne clearly wouldn't want to let him go, but he'd let DM know the approach had been made.
If DM expressed a wish to talk to them, then Milne would let him as it would be pointless us having an unhappy manager with his mind elsewhere for 2.5 years.
I think DM would go if they approached.
IF this Portuguese bloke turns them down, I think we'll be looking for a new manager next week.