So last match I've played against Brighton with West Ham, and one of my substitute player (Felipe Anderson) came up to the field at 87' he didn't do anything and got the man of the match.
@Ge0rge22 This is very common as a lot of times a player that comes in during the last minutes of a game gets man of the match even though they did not even get a rating or do anything. I wonder if this is a bug or something.