Dr Patrick will conduct the three spacewalks to install the two modules with colleague Bob Behnken.
During the mission, five spacewalks - each expected to last 6.5 hours - are to be completed.
That glitch followed last weekend's jammed airlock hatch that forced NASA to cancel a pair of spacewalks.
Four spacewalks are planned during the expedition, including what NASA said would be the first by an Italian.
The mission is set to include three spacewalks to store hardware on the outside of the orbiting outpost.
They floated on spacewalks, planted flags on the moon and built space stations, all playing their role in an international rivalry.
Any repairs later this week almost certainly will involve replacing the faulty ammonia pump, a difficult job that would require two spacewalks, AP adds.
Some smaller astronauts have had trouble fitting into those standard sizes, leading to charges that female astronauts don't have as many opportunities as men to do spacewalks.
In three further spacewalks to be undertaken in the next three days, two spectrographs will be installed and the remaining three of Hubble's batteries will be replaced.
Two spacewalks outside the ISS will be performed during the course of the Discovery mission, as astronauts work to equip a recently installed US research laboratory called Destiny.
Even during the shuttle days, unplanned spacewalks were uncommon.
While out on three spacewalks, Atlantis mission specialists Steve Bowen, Michael Good and Garrett Reisman replaced six solar array batteries on the orbiting platform and installed a backup communications Ku-band antenna and a robot tool tray.
So, assuming things go as planned, during the week of December 6, space fans will receive a holiday treat from NASA: a dramatic series of four spacewalks during East Coast overnight hours - followed during the day by some equally dramatic images from the surface of another world.
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