The 20-year-old extended his loan stay at Fratton Park last week and was due to remain on the south coast for the remainder of the campaign.
However, he was sent home from Pompey’s 2-0 defeat to Shrewsbury after turning up late for a team meeting scheduled for 1.30pm.
Passley issued an apology for his tardiness, tweeting: “Over the past 2 months the love and support I've got has been amazing and through my own actions I've let you all down - it won't happen again
“Personally want to apologise to the manager, team and the fans for my lack of professionalism.”
Awford told reporters it wasn’t the first time the Whites defender had been late and was due to hold showdown talks with the youngster to decide his fate today.
Passley has made nine appearances since moving to the League Two side in January.