Liverpool extended their record of consecutive Premier League wins to 16 after beating Sheffield United 1-0 at Bramall Lane on Saturday.
Liverpool recorded their first ever Premier League victory at Bramall Lane in four attempts and extended their perfect start to the new campaign.
Wijnaldum admitted afterwards that Jurgen Klopp's side did not play well during the game.
"We didn't start the game well," said Wijnaldum. "In the first half we slowed the game down too much and that's why they could stop us.
"It was not the best game we had but we won. A few years ago we would not have been able to win these games."
The Senegal international missed another golden chance just before the break after he hit the post from close range after being put through by Roberto Firmino.
Liverpool dominated posession in the second half but failed to create any clear cut chances.
Liverpool took the lead three minutes later in fortutious fashion when Wijnaldum struck a volley on the edge of the box that went straight through Henderson's legs.
Salah had a fantastic chance to score a second but Henderson made a save with his foot.
Substitute Leon Clarke had a wonderful opportunity to score an equaliser late on but blazed his shot wide from a cross.
Despite the victory, Jurgen Klopp said that he was "frustrated" by his side's performance.
"These games, they are not all beauties and you have to work hard for the results," he said. "I was frustrated, and at half time we spoke about it.
"We started well, but you have to do the same things again and again. It's about body language, it starts with the centre halves, it's the little things."