Tony Culhane will not be riding at York today after suffering concussion in a fall from the Linda Perratt-trained Get Stuck In at Hamilton on Friday evening.
The jockey has been stood down for seven days, which runs into the lengthy ban he starts on July 19 as a result of dropping his hands on True Courage at Pontefract on Tuesday.
"He's been stood down for seven days," his agent Paul Grundy explained. "It was after the big sprint they had up there, he was just pulling up and as the ground was so sticky, the horse's feet just went in and he went straight out the front."
Culhane was passed fit to ride Lavinia's Grace for Mick Channon in the following race but Grundy said: "He was a bit dazed.
"The doctor passed him fit but the girl from Mick Channon's - who knows him - said he wasn't right and wasn't riding their horse."
Grundy added that the support Culhane had received from trainers since the infamous incident earlier in the week had been "brilliant".
Among the jockey's booked rides were the well-fancied Kirovski for Peter Harris in the 43rd John Smith's Cup, and the hat-trick seeking Lady Two K in the Foster's Silver Cup Rated Stakes.