It means it could be Wednesday before the teenage striker is able to link-up with Pompey, albeit still comfortably before Friday’s deadline day.
That would allow him to be considered for a Blues debut in Saturday’s visit of Sunderland to Fratton Park.
O’Mahony started Brighton’s final match of last season’s Premier League campaign, lining up against Bournemouth in April.
He was withdrawn at half-time of the 3-0 defeat, yet totalled three top-flight outings and four Bristol Street Motors Trophy appearances in a breakthrough season.
However, with Brighton currently splashing out and strengthening their squad, boss Fabian Hurzeler is keen to let the youngster leave on loan to maintain his promising development.
Sheffield Wednesday have also shown interest in the former Cork youngster, but Fratton Park has been pinpointed as the preferred destination.
O’Mahony will bolster a frontline missing last season’s top scorer Colby Bishop, having undergone heart surgery earlier this month.
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