"To negotiate a transfer" means to engage in discussions or conversations with someone to arrange or agree upon a move or transition from one place, position, or organization to another. Full definition
The two clubs met last summer to negotiate the transfer of the 28 - year - old but in the end he decided to stay with the Gunners. (fastonetwo.com)
If a club wants a certain player, they can negotiate a transfer fee with his existing club as compensation for letting said player out of his contract early. (sbnation.com)
I do not think there is a problem with the way we go about negotiating transfers, the problem lies in what we are aiming to achieve. (justarsenal.com)