Dawn Approach has been put on a course of antibiotics after a bad scope following his defeat in the Prix Jacques le Marois.
The Jim Bolger-trained, Godolphin-owned 2000 Guineas and St James's Palace Stakes winner was expected to go well at Deauville but never figured and was eased off by Kevin Manning.
Godolphin racing manager Simon Crisford told godolphin.com: "Jim Bolger told me that Dawn Approach scoped with mucus after the race but he had been fine when tested before he left Ireland on Saturday.
"Dawn Approach is now on a course of antibiotics and will be rested until all is well with him."
He was running just 11 days after losing out to Toronado in the Sussex Stakes at Goodwood.
