The Yankees have neither confirmed nor commented on the reported signings.
According to FoxSports.com's Ken Rosenthal, both Anderson and Sisco were also given invitations to the Yankees' Major League Spring Training camp.
Anderson, a former outfielder who converted to pitcher this year, opted for free agency earlier this month after the Royals outrighted him to Triple-A. He moved to the mound after struggling to make the Royals' roster out of Spring Training. Following the switch, he spent time at three Minor League levels, compiling a 2.08 ERA in 14 games.
Sisco, believed to be healthy after undergoing Tommy John surgery in 2008, went 4-4 with a 4.32 ERA for the Giants' Double-A Richmond squad this past season. Originally a second-round Draft pick by the Cubs, he appeared in 48 games last season, all of them in relief.