Day rapped for dismissal
That will rule out key defender Day from three massive games in Hungerford's end of season promotion run-in and Wilkinson could offer no defence of his on-field leader.
"He was hardly leading by example," said the manager, who described the dismissal as "embarrassing."
"I don't know what he thought he was doing, going in two-footed like that. Yes, he won the ball, but there was absolutely no need to go in like that, and now he's going to miss three games at this stage of the season."
Day is available for this Saturday's trip to Mangotsfield United before missing games against Gosport Borough, Halesowen Town and Paulton Rovers - two of them promotion rivals - and Ryan Crockford, Matt Jack and Luke Hopepr are all fit to start.