Really? That would be great - if we go on a run we're bound to meet them at some point. I can't remember the last time I saw a player play against their 'parent club' (though my memory is sh!te). I'm sure years ago someone scored against their actual club for their loan team and since then clubs started sticking the clause in the loan contracts
its def a rule:
In the Premier League, players on loan are not permitted to play against the team which holds their registration (section 7.2 of rule M.6).
they changed it cos the clubs involved were just doing it on the sly anyway ie. utd when we loaned tim howard.