Barcelona had almost 70% of the possession, 24 shots, 51 touches in Arsenal's half and 11 corners, yet scored only once.
Arsenal drew with defending champions Barcelona on Thursday night, a result that improved their chances of reaching the knockout stages.
Criticism of Arsenal this season has centred on a lack of ruthlessness and an inability to turn dominance into wins. On Thursday the balance of the match ran the other way.
Frida Maanum opened the scoring against the run of play in the first half. Arsenal reached half-time still ahead, despite 18 shots from the hosts.
Barcelona's solitary goal later levelled the match. Arsenal held on for a draw and a point.
"This is a very different game to play but there are of course elements in the performance that we want — and need — to take forward,"Slegers said.
Slegers said the point was acceptable, though Arsenal had wanted all three."The one point is okay for us, though obviously we went for three,"Slegers said.
Slegers said games against Barcelona are always difficult because they are so good on the ball, and that Arsenal had shown a side of their play they need to produce in every match.