The Sox, according to an industry source, have expressed significant interest in free agent pitcher Kevin Millwood, the American League's ERA leader in 2005, who had a 9-11 record with a 2.86 ERA. There were indications last night the Red Sox were trying to arrange a visit for Millwood, though CEO Larry Lucchino is in San Diego for the holiday and principal owner John W. Henry was said to be visiting relatives. At the moment, Boston's most serious competition would appear to be the Texas Rangers, who yesterday made an offer for the righthanded Millwood, who turns 31 tomorrow. Millwood's agent, Scott Boras, is seeking a five-year deal for Millwood, who last season was paid $7 million by the Indians.