Despite dollar's rebound after yesterday's cross-inspired selloff to 99.31, a breach of resistance at 100.37 is needed to signal this week's decline from 101.45 has indeed formed a temporary low there and bring subsequent correction towards 100.87 (yesterday's Asian session high).   
On the downside, below aforesaid support at 99.31 would bring one more fall to 98.90/00 but 98.50 should limit weakness due to loss of momentum.