It had been reported that United felt 'confident' and were 'close' to agreeing a fee with Inter that could total £44m including add-ons. But the speedy conclusion of any deal was always going to hinge on whether things could be suitably wrapped up before Inter's tour departure.
It was thought that Perisic was not keen to travel with the squad as he waited for his proposed move to United to be completed after weeks of difficult negotiations between the clubs.
But after a suitable breakthrough was seemingly not reached in time, he had little option but to report for duty on Tuesday morning and will now be heading to Asia where Inter will be playing a total of four games between now and the end of the month.
The United deal is not by any means dead, although through to full completion it will now almost definitely take longer than was expected just this morning.
Negotiations will certainly continue, and it may be that, if successful, United are ultimately left to announce a deal subject to medical and personal terms while they wait for Perisic to arrive in person from Asia, as they have done with both of their existing signings so far this summer.
Inter's 28-Man Tour Squad in Full:
Goalkeepers: Tommaso Berni, Samir Handanovic, Daniele Padelli, Marco Pissardo
Defenders: Cristian Ansaldi, Danilo D'ambrosio, Miranda, Jeison Murillo, Yuto Nagatomo, Andrea Ranocchia, Milan Skriniar, Zinho Vanheusden, Federico Valietti
Midfielders: Borja Valero, Marcelo Brozovic, Xian Emmers, Roberto Gagliardini, Joao Mario, Geoffrey Kondogbia, Rigoberto Rivas
Forwards: Gabriel Barbosa, Jonathan Biabiany, Antonio Candreva, Eder, Mauro Icardi, Stevan Jovetic, Ivan Perisic, Andrea Pinamonti