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Injury affects all clubs and that is no exception to any club no matter how strong and vigorous they are in the field of play. Saying injury can’t affect Manchester City players is false, when De Bruyne was injured, we can see the plenty problems that Manchester City was facing in the midfield until his return back in the pitch. The second eleven of Manchester City can’t win Arsenal and Liverpool, it is was that easy, the first team would have found it easier playing with these teams, so I don’t believe that is even possible to think of. Manchester City are good but you can’t give them that type of hype. The FA Cup final is going to be on an average level even though Manchester City has the better chance of winning the FA Cup final. Manchester United will try to win their first trophy of the season but looks very much impossible from this angle, but they can try their best.
Nothing is impossible, everything is possible.
I can say Manchester United to win that final match from Manchester City, but of course with good strategy and play throughout the match. But here, I don't waste much energy supporting Manchester United, even if there is a possibility of seeing Manchester City lose.
I believe Manchester City will try to win the FA Cup title this season. They want this title as a complement to having previously managed to win the Premier League title for 4 consecutive seasons, so Manchester United's defeat looks more likely to become a reality.