Personally, one thing i always always do. Two days before a game, i go onto the opposition squad, top left i select their 'mental' attributes and sort the whole team out by their Determination.
After ordering them by their determination (low to high), i pick 3 first time players with the lowest determination (15 or below)
I then 'talk to press' and under 'match performance' i Assertively point them out as the 'weakest link' for the next match.
Then the next day (day before the match) they'll talk to press and say "i can't get the comments ..... said out of my head, i'm not looking forward to the next match"
This way when it comes to match day, their morale will be 'poor' or even worse, so they'll be prone to making lots of errors!!
OR even better, the manager will drop them from the squad because he doesnt want someone who's not looking forward to playing on the pitch
This works everytime for me, i do the same routine before everygame, picking on the weakest psychological players so they'll either make mistakes during the game or be dropped altogether.
Doesn't matter what team as long as their determination is low you'll always dent them mentally.
I've used it to great advantage against big clubs (Man C/Barca etcetc) They've always got one or two with low determination.
It's a good way to get rid of a couple of their players and/or get them to change tactics or play less skilled players