Cillian Sheridan's time at Celtic looks to be over after the striker was left out of the club's 25 man squad that flew out to the United States this morning.
Celtic face Philadelphia Union on Wednesday in Neil Lennon's first game in permanent charge with the 21-year-old striker left behind in Glasgow.
Lennon is looking to add a striker to his squad but was unable to find a place for Sheridan in the squad that left Glasgow this morning.
Untried strikers Paul McGowan and Ben Hutchinson were included in the Celtic squad ahead of Sheridan.
Hutchinson spent last season on loan at Swindon and Dundee starting just 14 games and scoring twice whilst McGowan scored once in seven Celtic appearances last season.
Sheridan ended last season picking up two international caps against Algeria and Paraguay and was hoping that a regular run at Celtic would boost his international prospects after spending last season on loan at Plymouth and St Johnstone where he scored six goals in 12 starts.
At the end of last season Sheridan said: "I need to do well in pre-season. I know I'll be under more pressure than ever, people will expect more from me. It's a year since I've been at Celtic, but being away made me a better player. It's been a good end to the season for me.
"It just shows if you play regularly people see you and give you a chance. You'll never get picked for your country if you're not playing for your club."
Sheridan has been on loan at Motherwell, Plymouth and St Johnstone since he last played for Celtic and is likely to be shipped out on loan again.
Hearts and Aberdeen have been quoted with an interest in the striker from Cavan but after making his international breakthrough a permanent move to the English Championship could appeal to Celtic and the player.
Sheridan wasn't the only player disappointed by Lennon's first selection with Graham Carey also left behind.
Carey had an impressive loan spell at St Mirren last season, including an appearance in the Co-Operative Cup Final against Rangers, but has also been left out of the squad for North America.
Mexican Efrain Juarez is expected to join up with Celtic in Philadelphia to complete a £3m transfer from Pumas.
The 22-year-old right-side full-back or midfielder had a brief spell at Barcelona three years ago and made three appearances at the World Cup in South Africa.
Former captain Stephen McManus was another omission from the travelling squad and is expected to complete his £1.8m transfer to Middlesbrough in the next couple of days.
Charlie Mulgrew and Cha Du-Ri were the only new faces on the flight with the final details of Joe Ledley's signing still to be completed.
Artur Boruc and Aiden McGeady joined the squad in Glasgow despite strong reports that they could be leaving Celtic.
Boruc is a £3.5m target for Fiorentina and Espanyol whilst a number of English clubs are keeping tabs on McGeady.