I'm not sure but I'd have thought they were counted towards sick leave on your record, as it is sick leave, but that, should there be any action such as a formal absence review triggered (which they may not have any discretion over if it's automatic within your workplace policy), they may have some discretion as to what, if anything is done.
It all depends on the circumstances though and your employer's policy. It may have an impact on whether the workplace was at fault in any way for the injury or whether it wasn't their fault as such, just happened in the workplace. Also the time off sick for that, compared to other time off sick within the trigger period (possibly previous time too) and the reason for that time off sick. For example, if a large part of the sickness absence was for a reason that they would be likely to look to refer to occupational health for assistance and monitor things in a review period, rather than a warning.
I'm not sure if ACAS cover where you live, but worth checking with them if so, they have a lot of information on their website and a helpline.
http://www.acas.org.uk/index.aspx?articleid=1461
If you have a Union at work which you are in, could be worth having a chat with your rep too.