Nigel Worthington hopes Shane Ferguson "sees sense" and commits himself to the Northern Ireland cause as soon as possible.
The Northern Ireland manager's preparations for tonight's Euro 2012 qualifier against Estonia and the subsequent trip to Italy have been sidetracked by the Newcastle defender's failure to answer a call-up to the squad.
Worthington wanted the 20-year-old to come to Belfast to replace the injured Jonny Evans but, for the second time this year, he received no response from the player.
In May, the manager revealed he had been unable to raise Ferguson on the phone and he has again failed to contact the left-back ahead of the Group C double-header.
There were concerns on the first occasion that Ferguson, who has one friendly cap but has yet to represent the senior side in a competitive fixture, was poised to switch his allegiance to the Republic of Ireland.
He subsequently accepted a call to play for the U21s last month, seemingly putting the issue to bed, only for Worthington to be frustrated again this time.
"I've been trying for 36-48 hours to get in contact with the boy to let him know I'd like to draft him into the squad," Worthington said on the eve of what could be his last game at Windsor Park, should the IFA not renew his contract.
"His club has been notified, but we've had no contact.
"It beggars belief when you read in the press that people want to represent their country and when you give them the opportunity to do so there's no willingness, or manners, to say 'no I don't want to be involved' or 'yes, I'm coming'.
"I can only do what I've done. and we can't do any more.
"We can't put hands on and literally drag people in."