Following United's 3-1 loss to Burnley yesterday, Warnock was impressed by Cas' performance, and he can only have boosted his chances of a move with a cooly taken finish after 13 minutes.
"Neil said he was quite impressed by Cas, but there have been no further developments." Said a Sheffield United spokesman earlier today.
So at the moment it remains to be seen if Cas will be returning to Meadow Lane, or making a permanent switch to Neil Warnocks promotion chasing side.
Notts County MAD will keep you bang up to date with the latest developements as and when they happen.