Originally Posted by
Tactician
Remember what I told you? There is probably a random switch done to a player when the player is transferred from one club to another. This means that the player may perform better or worst than what he did at his previous club. So, if this is considered, you can neglect the past performance statistics of the player.
You want to check the possibility of what I said to be true? Sign the GK, use him and you will probably see the difference in stats after he played some matches for your team, unless of course if the random switch went to the same 'level' or performance but this will unlikely to occur as the probability is low.