Liverpool already had their own Jeremy Doku but Arne Slot mistakenly let him leave - opinion

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Jeremy Doku tore Liverpool apart on Sunday during Man City’s 3-0 win.The Reds were swept aside by Man City in a game that really showed the gulf in class, with Doku one of the main reasons for the result.The Belgian had a simply sensational game on the left and everything good went through him, with the winger causing Conor Bradley all sorts of problems, even if the right-back did stick to his task well.Join our newsletter for news & smart analysis. Doku, though, is exactly the type of player Liverpool were missing for this game, but they did once have their own version of the 23-year-old, but Arne Slot decided to let him go.Photo by Richard Sellers/Sportsphoto/Allstar via Getty ImagesLiverpool should never have sold Luis DiazDoku is one of the most exciting players in the league when he is on form, but so too was Luis Diaz during his time at Liverpool.The Colombian was one of the best dribblers in the division; that meant most teams had to double up on him just to stop him, something the Reds tried to do with Doku on Sunday.He would carry the Reds up the pitch and be a real threat in the final third, again something Liverpool were missing not just in this game, but perhaps all season.Diaz has also carried on this form for Bayern Munich since leaving which has only shown how big a mistake the Reds have made by letting him go, especially as they never directly replaced him.READ MORE: Liverpool fans think they know why Hugo Ekitike’s form has plummeted after Man City stinkerUnlike most, Diaz has a knack for creating something out of nothing, and given that Liverpool hardly laid a glove on Man City, then it is clear that he should never have been sold.Liverpool must buy a winger in JanuaryBased on how Liverpool have got on after the summer they have had, it is clear that you cannot just chuck money at it and hope something sticks.However, there are still areas that need reinforcements, so a similar tactic will need to be deployed, with a new left winger needing to arrive.Although there are problems elsewhere that need addressing, such as the defence, Liverpool still need a Diaz replacement due to how vital he was to the team.Cody Gakpo has done a decent job but he does not have the goal threat nor the energy of Diaz, meaning an addition is needed.Someone like Antoine Semenyo has been discussed and could be a good option, but either way, someone needs to arrive in January.