Three games in six days as a head-spinner for any manager, and Brendan Rodgers has a balancing act to consider. It was the Hoops so-called second string that the Irishman called upon against Hibs and St Mirren, both to varying degrees of success, with the likes of Oh and David Turnbull proving to be the heroes against the Buddies midweek, while James Forrrest and Mikey Johnston couldn't provide the same at Easter Road.
All eyes on Atletico as Celtic face elite level competition after what will be an arduous affair against sticky Ross County who showed their powers of recovery in Leith.
And Rodgers will be buoyed by the return of key defender Cameron Carter-Vickers after deploying Liam Scales and Nat Phillips in midweek, but the Irishman could look to give his American rock the weekend off.
Maik Nawrocki is available while Gustaf Lagerbielke didn't make the Hoops bench against the Buddies. Summer recruits Odin Holm and Yang impressed off the bench and could be handed deserved starts, while Reo Hatate and Liel Abada remain sidelined.