The 32-year-old forward was given an extended break following his part in Portugal's Confederations Cup campaign, before appearing at a Spanish court to answer charges relating to his tax returns.
Ronaldo has denied he evaded tax or hid details of his income from the authorities - charges that led the world's best player to seriously consider a move away from the Bernabeu earlier in the summer.
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However, the Portuguese appears set to stay put and, despite only just returning to training, has been included in the 24-man squad taking on former club United in Macedonia.
Real Madrid face Jose Mourinho's Europa League winners in the UEFA Super Cup in Skopje on Tuesday evening.
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