then don't reject his offer.
Set the price you want and keep him waiting.
It's better that way as your player is vulnerable to the skill point random daily gift from friends
(or forget and set him to training with the other players)

Here I have a regular 0 token customer ( ), I set 4 token and waiting for the next offer
Zero T negotiation offers-nego-gk-0-t-1.jpg

Here is a manager who 's asking one more token for the offer I made.
I hope he 'll reject my offer (of 5T) as I already found a player like him in the market.
Now I 'm waiting for the other guy with the three positions.
8 tokens but no reply yet

Zero T negotiation offers-new-nego-offers-i-did.jpg