Kieren Fallon will miss the two-day Guineas meeting at Newmarket after being slapped with a 10-day suspension at Kempton on Wednesday night.
The six-times champion jockey was found guilty of not riding to a finish aboard Sukhothai in the Racing At skysports.com Handicap.
The James Fanshawe-trained three-year-old finished third, a length and a quarter behind runner-up Watered Silk.
Fallon will now be sidelined between 27 April and 6 May, missing both the 1000 and 2000 Guineas at UK racing headquarters.
Fallon has not yet decided whether to appeal against the suspension or not, but he does not hold out much hope of the decision being changed.
'I'm speaking to Kevin Darley (chief executive of the Professional Jockeys Association) about it, but I'll have to be realistic about it as the chances of getting it overturned are slim.'