Brendan Rodgers' side are up against Austrian league leaders Salzburg, having kicked off their Group B campaign with a 1-0 home win against Rosenborg.
Steven Gerrard's men also face Austrian opposition in Group G. Rangers started with a 2-2 draw away to Villarreal and now host Rapid Vienna at Ibrox.
Celtic kick off at 5.55pm while it's an 8.00pm start at Ibrox. Both games are live on BT Sport.