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Are those old domains indexed in Google still?
Netmeg, Google doesn't normally index a domain that 301 redirects as far as I know. Wouldn't the issue be that Google still indexes the "many directories and sports sites still link to "myfootballdomain".com"?
But the SERP url contains the path's of pages on my education site - for example, the result looks like this:
but clicking on that result took you to the education site with that path: