City take on Arsenal at Wembley on Saturday evening before United face Chelsea a day later.If both City and United win, they will face each other in a final at Wembley to be played in August.With the Premier League having altered its substitution rules in order to alleviate the strain on players who are in the middle of a hectic schedule due to the coronavirus, many fans will be wondering whether the FA Cup has followed a similar solution.Here are the important rules you need to know for the weekend's games.As with the Premier League, the FA are allowing sides to make five substitutions during the game.Clubs are allowed to name nine substitutes in a match squad, with managers given three opportunities to make substitutes during the.
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