Possibilities
He did not have a backup GK; so he bought one from the transfer market.
He bought 1-2 GKs from the transfer market to satisfy the system's need for him to buy a GK.
He trained his GK and upped his rating by one star.
He sold his apparently non-reliable GK, and replaced it with a better-rated GK.
(He reported the situation (repetitive GK recommendations) as harassment to the appropriate authorities.)