The Ghana international has moved from Ukrainian side FC Dnipro where he was being frozen by manager Juande Ramos.
Inkoom is in search of regular playing time to boost his chances of making Ghana’s final 23-man squad to the 2014 World Cup finals.
Last season, he spent the second half of the campaign at French Ligue 1 side Bastia but had limited playing time.
Platanias are 14th on the 18-team table; two points above the drop and Inkoom is determined to contribute his quota to pull away from relegation zone.
“I am very happy to be here at Platanias. He (the coach) continuously me updated about the team from the first moment the coach showed interest in me,” Inkoom said at the unveiling ceremony.
“I think that is a very good team and a truly professional team with good organization. I’ll do whatever it takes to help the team move forward in the New Year.
“I’m here to fight with all my strength and give them all to Platanias.”