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The main threat to Manchester City against Liverpool is obviously Luis Suarez. Not only does the Uruguay international score goals, he sets them up, creates them and pressures defences into making them.
Suarez may have only scored four league goals this season, but the 24-year-old has on average 4.5 shots per game, makes 1.8 key passes per match, completes 2.3 dribbles per game, hits an accurate long ball per match and an accurate through-ball, and sprays around 33 passes per match.
He may technically be a forward, but Suarez's movement across the pitch makes him a typical centre-forward on the end of chances, a vital Wesley Sneijder-esque playmaker, a flashy winger and, with his 1.6 tackles won per game, a playmaking holding midfielder.
As his past performances have shown, he tends to raise his game for the big occasions, meaning he'll be at a peak athletically and mentally for this game.
Therefore, City will need to keep him quiet if they are to stop him from scoring, making an assist or starting off an eventual goal—and thus winning the game.
And the only way they can do that is have a holding midfielder be a permanent man-marker on him, as opposed to zonal marking.
So if City are to win, the likes of Nigel De Jong or Gareth Barry will have to mark Suarez out of the game.