Why did you crop off his elbow?
Because not cropping the elbow left a lot more of the player behind him which, being more or less in focus, was distracting from the subject. And also the third player back in orange. Further his elbow was not central to the subject which I interpreted as his expression and his (attempted) handling of the ball. Plus with the head already being cropped, cropping the elbow put it in balance w/ the cropped head, making the composition seem intentional rather than accidental.
I would prefer to put the subject at or near the 1/3 vertical, but alas, that wasn't really working w/ a simple crop.
Also, I spent less time cropping and adjusting he exposure than I just spent typing about it. My point was for the OP to get a free editing program and do some of this himself.
To his own taste. As in whatever crop and adjustments I made were more for illustration, and not the "best I could do".
Ideally, the shot would have been at a longer focal length and a wider aperture, which would have blurred the background already, and allowed for a different crop. But it wasn't. My best effort for this image would probably include a layer mask so I could blur the #14 player considerably, and the rest of he background even more. In which case I may have cropped a little looser.
Now let me ask you: Why would you leave the elbow and distracting background?