Don Mattingly’s $2.8 million salary this season was believed to be the sixth-highest among major-league managers. Not only was the number too high for the cost-conscious Marlins, but it also was out of line with an industry trend in which teams continue to reduce managers’ pay.



To keep his job and get an extension, Mattingly needed to accept a significant pay cut. And in his new two-year deal, announced by the Marlins on Friday, that is exactly what he did, according to major-league sources.



The exact financial terms of Mattingly’s extension are not known, but one source estimated that his salaries will be in the $2 million range and possibly below.



Michael Hill, the Marlins’ president of baseball operations, did not respond to a request for comment. Mattingly said he has never discussed the financial details of his contracts as a player, coach and manager.



“The way I would say it is just as I said at the press...