International Organization for Migration (IOM) said more than 100,000 refugees have reached European countries so far this year.
The organisation said in a statement on Tuesday that 97,325 refugees have arrived in Greece while another 7,507 have reached Italy
"Over 410 migrants and refugees have also lost their lives during the same period, with the eastern Mediterranean route between Turkey and Greece continuing to be the deadliest, accounting for 321 deaths," the IOM said.,
Greece’s four out of five new refugee registration centres are "ready to function and welcome refugees," Defence Minister Panos Kammenos said last week, as some EU members blame Greece's border security over the increased number of refugees they have allowed entry to into Europe.
The four refugee centres are located on the islands of Lesbos, Chios, Leros and Samos, which have been struggling to take its continuous refugee flow under control.
In response to the refugee flow into Europe, Austria announced last week it would only accept 80 refugees a day and allow a total of 3,200 to transit the country annually.
Slovenia, Serbia and Croatia have also tightened their borders.
Hungary announced it was ready to quickly build a fence on the Romanian frontier if refugees were to make their way towards the country.
More than a million refugees have reached Europe, while Turkey hosts the most in the world, opening its doors to 2,7 million Syrian fleeing civil war.