it used to be a policy of Chelsea among many other teams not to let loaned out players play against their parent club,the F.A then made it into a ruling for all English teams. i`m not sure how it applies to English clubs in europe but i guess it`s the same..it is a good thing i think. say we signed DeBruyne,loaned him back to Genk. Chelsea plays Genk,the score is level and he scores an own goal that wins the game for Chelsea..he`d probably get lots of shit for that and probably be accused by some of doing it on purpose. it`s to avoid things like that happening that they do it for every team in England now.