There is a rule of the transfer market that can be avoided. The rule in question is:
"You cannot bid for more than two players from the same team in a short space of time."
(I think there are two of them but I'm not sure and I'm not sure how long to wait to be able to bid again from the same team. But that's the rule.)
Well, using another account that bids and get the player and next puts him up for sale avoids this problem. I have noticed this issue and am putting it here to be considered for future updates.
Possible solution:
For example it occurs to me that the restriction is maintained even if the player changes teams several times. That is, you cannot bid for players who have been on the same team for that short period of time.