Aerials over Turkey's border province of Edirne showed hundreds of migrants queuing and camping near the Turkish - Greek border on Thursday (March 5).
Ankara on Wednesday (March 4) accused Greek forces of shooting dead a migrant and injuring others - claims Athens rejected and said Turkish police helped migrants illegally cross into its territory.
Soylu said on broadcaster CNN Turk that officials were "making preparations" to apply to the ECHR over Greece's interventions with the migrants.
The families of two people who died have authorized Ankara to do so.
Last week, Turkey decided to no longer abide a 2016 deal with the European Union to halt illegal migration flows to Europe in return for billions of euros in aid.
Since then, more than 10,000 migrants from Afghanistan, Syria and other countries have been trying to breach the border.