The Ballydoyle maestro has been stuck on 20 premier wins for the season since Septimus won the Irish St Leger.
And after Henrythenavigator's defeat at Ascot, O’Brien’s King Of Rome could only finish third in the Preis von Europa at Cologne.
The Ballydoyle team sent out three runners to compete in the race but Colm O’Donoghue’s mount fared best of all.
Hindu Kush and Bashkirov were unplaced. The mile-and-a-half contest was won by Baila Me, with Poseidon Adventure a
close second.