American-born Argentine winger Michael Hoyos has signed a one-year contract with OFI, the Greek Super League club announced Tuesday.
The 22-year-old former Estudiantes player made nine appearances for the Argentine under-20 squad from 2010-2011 scoring one goal.
In other transfers on Tuesday, Platanias announced the signing of Portuguese defender Emidio Rafael, also on a one-year deal, with an option for a further season.
The 27-year-old played last season for Braga after three seasons at Porto.
And goalkeeper Alexandros Tzorvas, with 16 Greece caps to his name since his 2008 debut, signed a two-year contract with Apollon Smyrni, the newly-promoted Greek Super League club.
The 31-year-old moved back to Greece from Genoa, having also played a season for Palermo in the Italian league.
Greek Super League club Atromitos meanwhile said they would play four friendly matches while training in England this month.
The Athens club will be based in the northwestern city of Chester and have lined up friendlies against Barnsley (July 22), English Cup holders Wigan (24), Sheffield Wednesday (26) and West Bromwich (29).