Reports in the media today are stating that Stelios Giannakopoulos will sign for Liverpool this week in a £1million move.
The Greek Euro 2004 winner is poised to become Rafael Benitez's latest signing as the Anfield revolution under the Spanish boss continues.
Allardyce believes he gave Stelios the Premiership platform to boost his career and is disappointed in the disloyalty shown by the Greek midfielder.
Stelios, who has a £1m escape clause in his contract, is scheduled to hold talks with Liverpool officials over personal terms in the next few days before completing his move after a medical.