All this is a hammer blow to Notts County boss Gary Mills, who had been doing all he could in an attempt to keep the highly-rated keeper at Meadow Lane until the end of the season.
Henderson has been in outstanding form since joining the Magpies on-loan a little over two months ago. The keeper almost single-handedly got us a point at Northampton, and was hugely influential in the recent win at Rochdale.
In all, he is arguably one of the chief reasons for Notts' excellent away record this season. Fellow Irishman Saul Deeney is now almost certain to start at Field Mill, with Steve Mildenhall, recently training with Oldham, likely to return in order to provide cover.
All at NCM wish Henderson all the best, and hope this isn't the last we've seen of such a talent. We'd welcome you back anytime, Wayne!