Brian's O'Driscoll's calf injury is a major concern for Ireland boss Joe Schmidt ahead of the November Internationals. O'Driscoll will miss Leinster's clash with Castres at the RDS tomorrow which means he'll have missed both Heineken Cup games so far this season and, although Leinster head coach Matt O'Connor's hoping to have him back for next weeks home game with Connacht but he was unable to confirm if he'd be fully fit for International duty next month. The uncertainty is a worry for Schmidt ahead of November's Tests against Samoa, Australia and New Zealand.