I have developed my own theory around team talks. What I found was it is very random and ambiguous. The same team talk has different effect on different players, and I found no definitive relation of effect to player personality. In anycase half the time people do not listen or no effect is identified by the ass man.
What I do these days is, no team talk at all. I just let the players play their game. Only when one of these two options come up( one more goal and encourage team) I use them on the entire team. That happens when you are losing at half time, and occassionally when you are drawing a game which you shopuld win.
Rest of the team talks like you can win the game, one more goal will do it etc. I make a point to use. These are the only ones which make a positive difference to the entire team.
Also I use I have faith on players with poor/ok morale as these i have found mostly improve morale and performance.
Rest of the really ambiguos ones I really stay away from, the ones like I am pleased, you can win, wish luck etc. Because they make some players happy/delighted but don't improve performance./ Also if I was managing a real football team I wouild not have been delighted to see my players enter the pitch looking delighted :p
As this is a computer simulation game, it will always take 100s of variables to produce effects on players wih team talk. And since it is impossible to understand what it actually does, just stay away from them. If anything is not broke don't fix it, if the tem is playing well don't go and say I am pleased and make them delighted all of a sudden. Only use encouragement/one more goal at halftime, and have faith in you if a player has poor moraleor has had a bad half. This is the thumb rule I use.
Thought this might be helpful. Feedback/criticism welcome.
:thup:
Team Talks - Skip Altogether? 
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