The report said Valentine is to be introduced Tuesday. The Post first reported in late January that Valentine was a candidate for the opening.
Despite Valentine's tumultuous tenure in Boston, which consisted of much controversy leading to the Red Sox's final record of 69-93, he had a successful managerial career in the U.S. and Japan.
He has a career Major League record of 1,186-1,165 with the Rangers, Mets and Red Sox, including winning the 2000 National League pennant with New York.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.