Despite playing just one reserve team game since making his recovery from his latest injury Darius was not expected to even be considered for first-team selection for some time.
However, the big frontman has made the journey up North to Nottingham with the team and could feature in tomorrow's game with Forest as Jamie CUreton and Nicky Forster both have minor knocks.
Henderson notched up an 12 league and cup goals last season, however his influence faded towards the end of the campaign as he was struck down by a knee problem.
Meanwhile, new signing Steve Brown could be in line to make his Royals debut having signed on a free transfer earlier in the week. The veteran centre-back could partner Adie Williams if John Mackie is dropped for his racist outburst following last weekend's defeat at home to Sheffield United.
Alan Pardew has no new injury worries so is likely to largely keep the faith with the side that were beaten by the Blades last week.