you must pay attention very well first to the squad before you make an offer. the mistake most of the managers do is that they are targeting the best players of someones club. why should i sell my best players even for 20 tokens (which is almost 50 tokens for you) when i need 50 to get them? not even the reserves i would sell for a few tokens. but if you search well you can find oportunities. for example i am willing to sell a couple of players i don't need if i get 2-3 tokens. but not my best.