From the AP -
The Boston Red Sox cannot reduce their $51.1 million bid for Daisuke Matsuzaka in order to sign him, even if his Japanese team agrees to take less, baseball officials said Tuesday.
“There are no side deals in the situation,” said Jimmie Lee Solomon, executive vice president of baseball operations in the commissioner’s office. “Everybody’s been assured that’s not allowed, and everybody’s been made aware of the rules.”
Funny, as soon as the Yankees win a bid to talk to a Japanese player, MLB starts making announcements on rules against chipping down posting fees.