Celtic manager Neil Lennon and 13 players are isolating due to coronavirus but the club insists "rigorous" protocols were followed in Dubai.
Christopher Jullien looked offside when he scored the only goal of the Scottish League Cup final, much to Steven Gerrard's frustration.
Rangers squandered a host of glorious opportunities as Christopher Jullien's goal helped Celtic to a slender 1-0 win at Hampden Park.
Celtic beat Lazio 2-1 in their Europa League Group E clash on Thursday through a last-gasp goal from Christopher Jullien.
James Forrest and Christopher Jullien were on the scoresheet for Celtic as they beat AIK 4-1 in Stockholm to complete a 6-1 aggregate win.
Ajaccio have a mountain to climb in the second leg of their play-off against Toulouse, with another season in Ligue 2 looking likely.