The Reds were beaten for the first time in the division this season on Thursday night as goals from Sergio Aguero and Leroy Sane gave the hosts three points.
Roberto Firmino had levelled the score at 1-1 before Sane’s winner and the visitors pressed for another equaliser that would not materialise on an evening of fine margins.
“I think we did enough to get a point and we could have won it also,” Wijnaldum told Liverpoolfc.com after the final whistle at Etihad Stadium.
“We were quite unlucky with the chances but we also could lose it – like we have now.