He was exempted from his trial for the first five days after the court resumed its sittings last week.
Ruto was directed to be present for five days starting on Monday when the 29th prosecution witness is expected to start testifying.
The prosecution which is expected to close its case by March this year, will then present the 30th witness who is the last to testify in the case against Ruto and his co-accused Journalist Joshua arap Sang.
Defence teams of Ruto and Sang are expected to make a decision on if they will apply for a motion of no-case-to-answer.
Without a motion of no-case-to-answer the teams will then be required to make a defence case in which they will present their evidence and witnesses to counter allegations made by the prosecution.
The trial against Ruto and Sang kicked off on September 10, 2013.
So far 28 witnesses have testified in the trial in which Ruto and Sang are accused of planning and financing chaos of the 2008 post election violence during which over 1000 people were killed and half a million others displaced.
Four of the witnesses were declared hostile witnesses after they recanted their initial evidence to the prosecution and investigators.