query: PREFIX v: <http://www.wikidata.org/prop/statement/>
  SELECT ?item ?player ?itemLabel 
  WHERE 
  {
    ?item wdt:P31 wd:Q107185688. 
    OPTIONAL {?item p:P710 ?playerSet . 
    ?playerSet v:P710 ?player .
    ?playerSet pq:P413 ?position FILTER(?position = wd:Q715772)}
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }