Australia's David Johnson has been ruled out of the Ulster Grand Prix road races through injury.
Johnson (29), who competes in the Metzeler National Superstock 1000 Championship, was due to ride Kawasaki machines for Cookstown team McAdoo Racing at Dundrod, where he made a superb debut two years ago.
The Aussie lapped at over 127mph to earn the accolade of fastest newcomer in 2010.
He earned a ride in the Pedercini Kawasaki team for the World Superbike round at Silverstone, taking the place of Leandro Mercado, who has moved into the FIM Superstock 1000 class with the Pedercini outfit.
However, Johnson crashed out in race one, putting paid to his chances of competing in Northern Ireland this weekend.