Dear faisalmohamed,
Normally if they need me to add records, they will write " We sent you correspondence on xx xx, xx. If you have not yet provided the information or the requested documents, please do so as soon as possible. Please wait until you receive the correspondence before sending us additional information, as the correspondence will outline all information that is required. "
And do not want you to worry, but "We have sent you a letter on June xx. Please consider delays in mail delivery before contacting us." like your case is that they send a interview.
i.imgur.com/SRaJPqg.jpg (i have a picture of an interview, but I'm not allowed to send links)
Anyway, hope that does not happen to you, and everything will be fine - can they demand a medical examination certificate request.