Flood suffered the lower leg injury in the Heineken Cup semi-final win over Blues in early May, but if things go to plan in training, he could be on the bench to face Newport Gwent Dragons on Saturday.
Munster suffered a blow when Warwick was caught in the face by a stray leg and with no Ronan O'Gara on the bench had to turn to Conan Doyle, an elementary replacement at fly-half.
Van Nistelrooy is thought to have been unhappy at being left out of the side to face Charlton, after spending much of the second half of the season on the bench.
Labour's Lord Falconer of Thoroton, speaking from the front bench for the first time since 2007, said that the government's response flew in the face of "pages and pages of evidence".