The Reds took down the Belgian champions on Tuesday night through Alex Oxlade-Chamberlain's second-half strike after Wijnaldum's opener was cancelled out five minutes before half-time.
The result, and Napoli's draw at home to Salzburg, sees Jürgen Klopp's side sit one point clear atop Group E after four rounds of matches.
"It's a good result but we still have two games to play," Wijnaldum told Liverpoolfc.com post-match. "I think we have to look game by game and then at the end we will see how far we come.
"I think it was a really important win because the other two teams were playing against each other and it was a draw.