Parent clubs will accept all offers for players they are willing to loan but by the time you find a parent club in the first season the best loan signings are already snapped up.Second season ofcourse you get the choice of most of their players but its down to the player if he wants to join you or not.
I'm playing as Bradford City and after the first season with Bolton as my parent club i dropped them for Manchester City and not a single one of their players is willing to come on loan to me in league 1, Not a problem seeing as Bolton had noone i wanted to loan apart from Zoltan Harsanyi but they released him after a season on loan with me, As his new favorite club he joined me for free anyway so i got who i wanted.
Weiss looks like a great prospect i was suprised to see on my current game after one season Manchester City have released him on a free, I tried to sign him but sadly he had no desire to join me at that time, Not sure where he ended up but they got one **** of a deal.