Celtic are currently bottom of Group C having failed to win any of their five games.
Celtic's Stuart Armstrong in action as Barcelona's Lionel Messi goes down
The Hoops were handed an extremely difficult group in Europe this year as they were paired with Barcelona, Manchester City and Borussia Monchengladbach in the group stage.
The gulf in class has been evident too as they have failed to pick up a win from their first five games in the group.
Their latest defeat came this week as they were comfortably beaten by Barcelona at Celtic Park.
There have been some upsides, though, with the 3-3 draw against Manchester City particularly standing out.
And Armstrong says the one thing they have learned from playing in Europe’s top competition this season is the ability to play with the big sides.
“We’ve learned to compete with the best and patterns of play and how to overcome different situations against really top quality players,” he told the club’s official website.
“Playing against the best in the Champions League, which is arguably one of the best competitions football has to offer, against all the top-quality players in the world is definitely going to improve you as a player and help you learn.”
Barcelona's Sergi Roberto in action with Celtic's Scott Brown and Stuart Armstrong (R)
Armstrong and Celtic will now be hoping that experience they have picked up can help them to compete better in Europe in future.
They are unlikely to make the Europa League this season, with them currently bottom of Group C, three points behind Borussia Monchengladbach in third and with a much worse goal difference.
But the lessons they will have learned could prove invaluable in the long run, especially after missing out on the competition for two years under Ronny Deila.
Celtic manager Brendan Rodgers