The 30-year-old Gardner is hitting .286 with 15 homers, 50 RBI, 71 runs, 18 steals and an .831 OPS. He starts a four-year, $52 million extension next season, which also includes a $12.5 million club option for the 2019 season.
Prado was acquired at the last minute before the non-waiver trade deadline for minor-leaguer Peter O'Brien and a player to be named later. The versatile 30 year old is set to make $11 million in 2015 and 2016 before hitting free agency. This season, he hitting .268 with a .681 OPS.
Drew, 31, was also acquired right in front of the deadline, with Kelly Johnson going to Boston in return. He's set to hit free agency again this winter after re-signing with the Red Sox in late May. In 43 games this season, he's hitting just .179 with four homers and 16 RBI, but he does provide value on defense.
Though they are eligible to be traded anywhere now, it's hard to imagine the Yankees having real interest in trading any of these three starting players at this time.