The hamstring trouble that hampered Ward's campaign last season remains an issue for the Rams, who try to manage the diminutive forward's workload accordingly. He played the whole 90 minutes as Northern Ireland suffered an embarrassing World Cup qualifying defeat in Luxembourg on Tuesday night and is not due to report back for training until Friday.
Striker Conor Sammon and midfielder Craig Bryson have also been away on international duty with the Republic of Ireland and Scotland respectively but both players are expected to be fit for Saturday's game against the Lions. Sammon played 10 minutes as a substitute in Austria while Bryson did not get off the bench in Macedonia.
Midfielder Jeff Hendrick (ankle) has joined centre-halves Shaun Barker and Mark O'Brien (both knee) on the injured list.