Ronald Koeman.
If Saints lose to Norwich tomorrow, I'll actually put a couple of quid on Koeman to be sacked next. Saints have been dumped out the Europa League, he's lost Clyne, Schneiderlin and Alderweireld (possibly Wanyama now, too) and he's missed out on his top transfer targets. Saints haven't signed anyone of note - all they did was strengthen the bench with backup players whose primary role was for the Europa League (Juanmi, Soares, Martina), which they now have no need for. They've had an awful start to the season and look like a shadow of the team they used to be.
Here are their fixtures from now until Christmas.
Norwich (H)
West Brom (A)
Man Utd (H)
Swansea (H)
Chelsea (A)
Leicester (H)
Liverpool (A)
Bournemouth (H)
Sunderland (A)
Stoke (H)
Man City (A)
Villa (H)
Palace (A)
Spurs (H)
Arsenal (H)
They'll be playing 9 of last year's top 10 over the course of 15 games. There's a few must-win games in there, and if they don't get something from them, I can see Koeman going.