He joined the Swans in the summer of 2009, debuting against Scunthorpe in the Carling Cup in August.
Idrizaj also had loan spells with Luton Town and Crystal Palace while at Liverpool, having been named Austria's young player of the year before signing for the Anfield club.
He was honoured with a minute silence in Austria's U21 match with Wales on Tuesday in Parndorf.
Austria's senior team will also remember Idrizaj in a minute silence before their international friendly with Croatia on Wednesday.
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