For a footballer, it is always important to have confidence in the players that you're entering battle with. While familiarly can sometimes breed contempt, a team's chemistry is often one of the most crucial and unheralded factors that can make it shine.
You can be lost without it. For instance, how many times have we heard about new signings needing time to settle in? Or a fresh strike partnership having to work on things in training before they begin to hit it off on the pitch?
It helps, then, if you know everything there is to know about your teammates when you are taking to the pitch with them. Even if you're Lionel Messi.
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