The Reds scored three goals on the night with both Sadio Mane and Mo Salah getting their names on the scoresheet.
And the other goal in the game was scored by Wijnaldum during the 34th minute of the match.
Wijnaldum did not play during the 1-1 draw vs West Ham United after falling sick and the midfielder wasn’t expected to be part of the matchday squad this weekend too.
But not only did Winjaldum start but he was also one of the star performers vs the Cherries.
And now Jurgen Klopp has revealed that Winjaldum battled severe sickness in order to start on Saturday.
“We were not happy with the performances from the previous two games and struggled a bit with set-pieces. There were a lot of things we had to improve,” he told BBC Sport.
“We have had injuries and fit players who have become ill overnight on the day before a game.
“[Wijnaldum] didn’t sleep in the team hotel last night. He had diarrhoea and vomiting two nights earlier so he couldn’t come to the team hotel.
“We have high expectations and today we won in an impressive manner – we had some outstanding performances on the pitch. Goal number three was world-class.
“We wanted to show a reaction. It’s our job not only to come through but to really perform and convince.”
The return to Wijnaldum meant Adam Lallana dropped back to the bench and the Netherlands international brought in a lot of calm in midfield.
Wijnaldum will now have a lot of rest since Liverpool will play their next game vs Bayern Munich in the Champions League Round of 16 on the 19th of February.
Read: Here’s how Jurgen Klopp has been behaving inside the dressing room as the title race heats up.