Alli missed the Premier League win over Huddersfield Town at the weekend with a hamstring injury, with Mauricio Pochettino confirming after the 2-0 victory that the midfielder would not be ready to face Barcelona in midweek.
Defenders Aurier and Vertonghen, as well as midfield duo Dembele and Eriksen, have also been ruled out of the club's next two fixtures, leaving Pochettino light on options.
Still, the Spurs boss is boosted by the return of goalkeeper Lloris for the Group B fixture in Europe, with the France international available for selection after returning to training.
The World Cup winner missed his side's Champions League opener, as they let slip a one-goal advantage in the closing stages to lose 2-1 to Inter in Milan.
Fellow keeper Michel Vorm, meanwhile, is expected to be back in training before the end of the week as he continues to recover from a knee injury.
Pochettino has said of the selection issues he faces: "We have players with different injuries - it's not a pattern that happens from something specific.
"We are not victims though - we must feel strong. Every player must feel they can win and achieve what we want."