In his personal section, you can often see the line "is really fired up for todays clash". This gives a boost of moral, and usually results in a great performance.
or
It could put pressure on the player, forcing him to loose composure and confidence, always a good thing!
So, its up to you if you want to say something. I dont ask my scout to watch my next opposition, so i dont use this option antway, but i do use the manager interaction, this can also affect players too. | 
to praise or nt 
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