Hi there, looking for some advice re the below:

Colleague was involved in a physical incident at work and went home, assumption at the time was that this was due to physical injury from the incident. Colleague calls in sick for the rest of the week, handing in sick line from GP stating stress at work. 

RIDDOR criteria not met at this point.

Over a week later colleague claiming to have phsyical pain from the injury although this was not detailed in the sick line from the GP.

Do I take the colleagues word for it or do I go by the sick line from GP?

Would you report as RIDDOR just to be on the safe side?

Staff member has been asked to provide statement detailing the events of the incident but two weeks later this has yet to materialise.