Across the table, it's understood Diane Calvert and Nicola Young are contenders for the deputy job but if their bids were to ever eventuate, the left would vote them down.
Foster should be looking to the left to secure the numbers.
He needs someone who can reach across political lines and build consensus.
That could be Green councillor Iona Pannett, who missed out to Day last term.
She's an experienced set of hands but has also recently taken on a new role as Chief Executive of Birthright New Zealand.
The other option could be Labour councillor Fleur Fitzsimons.
Foster needs to start building relationships and fast, or he can kiss goodbye the progress he campaigned on.
It's becoming increasingly clear his mission to bring construction of a second Mt Victoria tunnel forward in Let's Get Wellington Moving would go down like a lead balloon with too many councillors.