Wijnaldum, has made 237 appearances so far for Liverpool since joining from Newcastle in July 2016, he won the Champions League and Premier League during his five-year spell at Anfield.
The 30-year-old was given a guard of honour in his final Liverpool game last month - the 2-0 home win over Crystal Palace - which guaranteed Jurgen Klopp's side a spot in next season's Champions League.
An emotional Wijnaldum told Sky Sports after the game: "I'm fighting against my tears right now.
"I've said that the people in Liverpool and the club, my team-mates, have shown me love during the five years, and I will miss them.
"I hoped to play many more years for the club but unfortunately things went different."