Sirri Sureyya Onder, a member of parliament representing the Peace and Democracy Party, told the Hurriyet Daily News the pullout by the outlawed Kurdistan Workers' Party PKK would probably take place 8-10 days from Saturday.
The withdrawal agreement was engineered by jailed PKK leader Abdullah Ocalan and the Ankara government.
Onder is part of a parliamentary delegation that has been shuttling correspondence between Ocalan and PKK leaders in Iraq.
The PKK leadership in northern Iraq has been busy with preparations for pulling their fighters out of Turkish territory, Onder said, adding he did not believe the rebels were stalling.
"All the factions ... are very determined to put into practice Ocalan's proposition and consolidate it," he said.