Alexander Isak has stayed behind in Newcastle while his team-mates are travelling to Singapore for their pre-season tour.
The striker trained alone on Tuesday amid mounting speculation over his future due to interest from Liverpool.
Liverpool have been told Isak is not for sale and would likely have to spend upwards of £125million to convince their Premier League rivals to sell.
It is unclear what Liverpool's policy will be after they announced the £79m signing of striker Hugo Ekitike from Eintracht Frankfurt on Wednesday.
But Mail Sport's Craig Hope can reveal that Isak has not travelled to Singapore, where Eddie Howe's men will take on Arsenal.