Managed Paths Can’t be used in List/Library/SubSite Names
We can not use Managed paths in SharePoint List or Library. E.g. “Sites” is a built-in Managed path. So you can’t name any list/library/sub-sites as “Sites”. This behavior is in SharePoint 2010 only and Not in MOSS 2007.
But you can use the managed paths in your Site collections. E.g. https://sharepoint.company.com/sites/sites