Celtic placed down an early Champions League marker after hammering Slovan Bratislava 5-1 in Wednesday's opener.

Arne Engels teed up Liam Scales' fierce headed opener in the 17th minute at Celtic Park, before the midfielder himself scored from the penalty spot in the second half.

Kyogo Furuhashi had earlier added Celtic's second goal of the game just nine minutes before Engels' penalty, awarded for a needless pull on Alistair Johnson by Danylo Ignatenko.

Switzerland defender Kevin Wimmer reduced the arrears on the hour with a delightful outside-of-the-boot finish, though Daizen Maeda soon restored the advantage 10 minutes later after linking up with Reo Hatate.

Substitute Adam Idah rounded the scoring off with four minutes remaining, latching onto James Forrest's pass to complete a convincing triumph.