The Warriors did not have a shootaround in Dallas on Wednesday.
On Tuesday, Casspi was listed as probable with a bruised rib, while Iguodala was listed as questionable because of lower back stiffness.
Casspi has appeared in 32 of the Warriors' 37 games this season.
Iguodala will be inactive for the sixth time.
Golden State plays again on Thursday in Houston.
Drew Shiller is the co-host of Warriors Outsiders. Follow him on Twitter @DrewShiller