Dickerson, 26, played 65 games during an injury-shortened 2015 season (plantar fasciitis in his left foot, broken rib), but he still hit .304 with an .869 OPS. In 2014, he hit .312 with a .931 OPS, 24 homers and 76 RBIs in 131 games.
Dickerson won't be eligible for arbitration until 2017, and he won't be eligible to become a free agent until '20.
McGee, 29, was limited to 39 games in 2015 due to injuries to his left elbow and his left knee. When healthy, he was arguably the team's most effective reliever, posting a 2.