In late December 2010, Portilla left Asturias and joined Aris Thessaloniki F.C. in Greece, signing a two-and-a-half-year contract.
Pada akhir Desember 2010 Portilla meninggalkan Asturias dan bergabung Aris Thessaloniki FC di Yunani, menandatangani kontrak dua setengah tahun.