He most notably scored the winning goal for Olympiacos' first match in the renovated Georgios Karaiskakis.
In the 2007–08 season, Gialousis was forced to wait patiently for his first chance to play, which finally came in Week 21 – Gialousis made his Super League debut on 16 February 2008, playing all 90 minutes in a 1–0 loss to Greek champions Olympiacos at Karaiskakis Stadium.
The Neo Phaliron Velodrome (New Phaleron) was a velodrome and sports arena in Athens, Greece, used for the cycling events at the 1896 Summer Olympics, which was later to be the Karaiskakis Stadium.
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The final took place on 19 May 1971 and was staged at Karaiskakis Stadium in Piraeus, Greece, which was filled to capacity by traveling fans of both clubs as well as local football aficionados.
His first appearance was in 21 April 2013 against Olympiacos in Karaiskakis Stadium.
A year later during the season 2012/13 he scored with the team in a tremendous 3-2 away victory against Olympiakos in Karaiskakis stadium.
Olympiacos opened the second round of the group stage with a draw 0–0 to Real Madrid at the Karaiskakis Stadium and kept alive the record of being undefeated by Real Madrid in Athens in four matches, while the Reds moved a step closer to qualifying for the last 16 after coming from behind to defeat Lazio 2–1 in Stadio Olimpico.