Campbell became the club’s youngster-ever European player when he came off the bench against Atromitos in Athens, and he could be involved in Newcastle’s two-legged Round of 32 tie against Metalist Kharkiv ... or at least have a place in the squad.
Willie Donachie has named his 18-man squad for the Viareggio Cup, which features 48 teams, and Campbell is missing.
Newcastle play AC Milan today in the Viareggio Cup.
They face a representative team from Congo on Thursday, and complete their group fixtures with a game against Empoli on Saturday.
NEWCASTLE SQUAD: Alnwick, Mitchell, Booth,Kitchen, Streete, Desmond, Satka, Nicholson, Logan, Miele, Sterry, Quinn, Olley, Heardman, Gillesphey, Aarons, McKinnon, Morgan.