Celtic, and Engels, will face much sterner tests in the Champions League.
Next up it’s a trip to face last season’s finalists Borussia Dortmund, and then another away game at Europa League champions Atalanta.
However, favourable home games against Young Boys and Club Bruges, plus an away trip to a Dinamo Zagreb side who conceded nine to Bayern Munich, mean a place in the play-off round, at least, is a distinct possibility for Celtic.
And while Engels was a standout in midfield, it was a terrific team performance full of intensity which got the job done in such style against Slovan Bratislava.
Nonetheless, the Belgian will surely play a key part and his message is he is just getting started.
“A lot,” Engels told BBC Scotland when asked how much he can improve. “I’m only here one-and-a-half weeks or so.
“I need to build relationships with the guys and work on every detail in training. And also seeing images from my game will help me improve.
“I hope it will only get better – I think so.”
