Ocalan, imprisoned on Imrali island near Istanbul, met his lawyers for the first time in eight years on May 2.
Gul said those convicted had the right to see their lawyers but this could be limited when there were concerns over security risks.
After the meeting earlier this month, his lawyers read out a message from Ocalan in which he said "Turkey's sensitivities" should be taken into account in Syria where a US-backed Kurdish YPG militia has spearheaded the fight against the Islamic State extremist group.
The PKK is proscribed as a terrorist organisation by Ankara and its Western allies.
Ocalan was caught in February 1999 in Kenya and jailed a few months later after he was found guilty of treason, separatism and murder.
Ocalan's brother was allowed to visit him in January for the first time since 2016.
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