Liverpool have been warned they may regret their decision to let Georginio Wijnaldum leave the club after he was released on a free transfer.The Holland midfielder has joined PSG after his contract at Anfield expired, despite being an important part of Jurgen Klopp's side for several years.Since leaving, Wijnaldum has opened up on some of the reasons he left the Reds, admitting that pressure from fans weighed heavily on him at times.And former Arsenal and England defender Sol Campbell thinks that those who were not watching him regularly in the flesh were probably not getting the full picture.Campbell also hinted that Klopp may rue the decision to get rid of a player he has relied upon so heavily over the last five years."He's a top player.
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