Jurgen Klopp’s side managed to keep a clean sheet in the first game after Virgil van Dijk was ruled out for the rest of the season and earned three points at the Johan Cruyff ArenA.
Fabinho played in the backline and was responsible for a brilliant goal-line clearance just before half time to protect Liverpool’s lead against Ajax.
Ajax changed things up from their typical formation and played 4-4-2 against Ajax, and Wijnaldum admits that it surprised him as he expected the Dutch champions to stick to their style of football.
He believes three points from Ajax is always a good result, but conceded that Liverpool could have played much better football than they displayed on Wednesday night in Amsterdam.
Wijnaldum told Dutch broadcaster Ziggo Sport: “I was surprised. I thought they were going to play their own game and not adapt.
“But I think it was a good tactic.
“Even if it could have been a draw, I do think we can do better than what we showed today.
“The result at Ajax is very good.”
Liverpool are back in league action this Saturday when they will host Sheffield United at Anfield.