Dragons will be without Aaron Jarvis and Harrison Keddie for the start of the season after both forwards suffered bicep injuries in training.
Wales prop Jarvis and back-row Keddie have already undergone operations and are expected to return to training in October following rehabilitation.
Keddie missed the bulk of last season with a shoulder injury but managed to play 12 games for Dragons.
Wales tight-head Jarvis joined in April from Clermont Auvergne.
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