Daizen Maeda scored less than four minutes into his Celtic debut as Ange Postecoglou's side returned to action with a 2-0 victory over Hibernian.
Josip Juranovic was also on target in the first half from the penalty spot as Celtic moved three points behind cinch Premiership leaders Rangers ahead of the champions' visit to Aberdeen on Tuesday.
Celtic's three Japanese January signings were given the full Parkhead experience after restrictions on crowd numbers were lifted just in time for the resumption of Scotland's top-flight following a reshuffled winter break.