From my observation, a leader requires high numbers in key attributes (Determination, Teamwork, Workrate >= 15; Influence 19 or 20)
For a born leader or charismatic leader, he requires high (hidden) mental attributes (Ambition, Loyality, Pressure, Professionalism, Sportsmanship, Temperament all >= 15 + Low Controversy), and high reputation (tied to player ability). Examples include Terry, Barzagli, Raul.
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