 Giannou netted his first goal for Apollon Kalamarias in late 2008, an 81st minute consolation goal in a 3–1 defeat at home to Kerkyra.Giannou would go on to score 5 more times in the 2008–2009 Beta Ethniki season before being transferred to Kavala, who had gained promotion to Superleague Greece for the 2009–10 season, on a five-year contract.On 21 November 2009 Giannou debuted for Kavala where he was substituted on after 79 minutes, after being played through on goal Giannou neatly passed the ball into the back of the net on the 88th minute mark to seal a 2–1 victory against AEK Athens.