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Ditto to all of the above. A 40D w/70-200 f4L IS has been my kids/adult soccer kit since 07, when a bit more reach is needed a 1.4x II T/C is added. Use the center point and anticipate, anticipate, anticipate the action and practice, practice, practice.
If you are worried about IQ when using a 1.4x T/C, take a look at the link below, it's a shot from last summer, youth soccer, a few friends enjoying a late July afternoon.
I've several action shots from the game as well and will update this post later today. Enjoy shooting the games, if you can find a local park/recreation center where there's basketball or just bike riders, skateboarders, etc. then take the opportunity to practice from distance as well as close up; many skateboarders luv to show off their skills, kick flips, 360s, etc.