Accidental or not, f/4 or not, I'll vote to allow it. I like the framing of the ball, too.
Even at f/4 you can get more background blur. The trick is to pick a focus closer to you and further from the player (obviously). Of course you weren't going for that in this case.
All of a sudden blurred backgrounds in football have become all the rage, but still photographers and movie companies figured this out a long time ago.








