1) place them in reserve
2) put them in goal keeper training
3) set them to high train on useless individual training attribute. i.e. striker - focus on marking. cb -focus on crossing and etc.
4) let them to train on useless preferred moves.
In the end hope their stats will drop when he join...
On FM12 ,the match preparation is different from the previous FM. Therefore there is no way to get back the old match preparation report. The best is to study see where your opponent assist most of their goal from and try to find a way to counter it.
free player - yaya sanogo, alberto paloschi, julien schieber, javier saviola, floccari
or cheap good player - alberto bueno, wilfried, leigh griffths (spelling), carlos fierro