After Dries Mertens' first-half opener, Dejan Lovren headed in at Anfield with 65 minutes on the clock to ensure the Reds remain top of Group E heading into matchday six.
The equaliser was part of an improved display from the champions of Europe following half-time, although Wijnaldum felt there should have been more opportunities to win the tie.
The No.5 told Liverpoolfc.com: “Sometimes you need those kinds of things – a goal or some momentum to come better in the game.
"We started well in the second half, we were the better team in the second half but it didn’t result in a lot of chances, or a lot of big chances, and that’s something we have to work on, in circumstances like this to still create chances.