For outdoor sport like soccer, in order to freeze the action with sharp image, usually I set the shutter speed to 1/500 - 1/1000 sec with shutter priority setting and adjust the ISO accordingly. For continue shooting AF mode to AI Servo for continue tracking of the moving object.
When you mention blur image, it can result in two possible outcome:
1. Out of focus for fast moving object, high shutter speed and AI Servo will help.
2. Fast action image blur, use higher shutter speed will help.
In summary, for sport event usually we shoot at least 1/250 sec and faster, to answer your question : IS do not help here.