Steve Cotterill is available - just been sacked by Shrewsbury (very harsh IMHO - he was doing a good job there on a shoestring budget). Cardiff is mentioned in this article as one of his possible options:
https://www.bristolworld.com/sport/...-manager-set-to-leave-league-one-club-4166114
We played some fantastic football under him when he was in charge of us - except it was only League 1. There is a very vocal contingent amongst our own supporters who believe he was hard done by when he was with us and has never really been given the chance in the Championship.
Opinions differ on this (the Forest fans called him a 'one trick pony' from his time there and I can understand why), but it would be very interesting to observe how he does if he's given a chance in charge of a second tier team again.