you can not take away bids, and also the starting price is unchangeable.
You could raise your player with a own bi to your wished starting price, but this option has also risks. Because if you don't sell him, you had to pay the taxes for the transfer, and he would be handelt as a new player and got high taxes.
So you must consider if you risk a cheaper selling price, or that you had to pay a bit to let him stay in your team and make him more difficult to sell afterwards.