Last year's champion conditional jockey took a tumble at the second flight from the Nicky Richards-trained Home Fire in a two-mile handicap hurdle.
He went to hospital for X-rays on his neck which showed there was no serious damage.
"He got knocked out, so he's had his X-rays. They were clean and he's OK," said his agent Richard Hale.
"He went to get X-rays on his neck and all was fine. It's just a case of passing a concussion test now in a week's time.
"He should be back for the Champion Hurdle anyway. He should be all right as long as he passes his concussion test."
McMenamin has struck up a fine partnership with the Ann Hamilton-trained Tommy's Oscar, winning six times aboard the seven-year-old – most recently in the Champion Hurdle Trial at Haydock. Only Epatante and Adagio are shorter in the betting for the Cheltenham showpiece among British-trained contenders.
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