Employee arrived for the shift, while walking across the wet limestone parking lot EE slipped and fell onto knees, causing contusion on L knee. At time of this injury on 9/3/19, EE thought was okay. On 10/24/19 EE reported knee still bothering EE. Was sent to Dr for 1st visit. On 11/4/19 EE had follow-up & Dr put EE on restrictions.