John Fitzpatrick
... that John Fitzpatrick became Manchester United's first ever substitute in The Football League when he came on for Denis Law against Tottenham Hotspur on October 16, 1965?
... that <b id="mwCAU"><a href="./John_Fitzpatrick_(footballer,_born_1946)" id="mwCAY" rel="mw:WikiLink" title="John Fitzpatrick (footballer, born 1946)">John Fitzpatrick</a></b> became <a href="./Manchester_United_F.C." id="mwCAc" rel="mw:WikiLink" title="Manchester United F.C.">Manchester United</a>'s first ever substitute in <a class="mw-redirect" href="./The_Football_League" id="mwCAg" rel="mw:WikiLink" title="The Football League">The Football League</a> when he came on for <a href="./Denis_Law" id="mwCAk" rel="mw:WikiLink" title="Denis Law">Denis Law</a> against <a href="./Tottenham_Hotspur_F.C." id="mwCAo" rel="mw:WikiLink" title="Tottenham Hotspur F.C.">Tottenham Hotspur</a> on October 16, 1965?