William Dunlop and Carl Rennie could miss the Centenary T.T. due to injury.
At this weekend's Cookstown 100 meeting in Northern Ireland, Dunlop suffered a broken scaphoid bone in his wrist after a crash in practice.
Rennie has a fractured collarbone after a spill in racing.
Both riders face a race against time to be fit for the T.T., with the first practice just 25 days away.
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