Gee was cut Monday, a day after he gave up eight runs and 11 hits in 3 2/3 innings against Atlanta in a spot start after being demoted to the bullpen.
Gee, 29, is being paid $5.3 million this year. He has a 5.90 earned-run average and sat out nearly a month because of a groin strain.
In his sixth big league season, Gee is 40-37 with a 4.03 ERA.
The Toronto Blue Jays put right-hander Aaron Sanchez on the 15-day disabled list because of a mild lateral muscle strain.
Sanchez was sent to the Blue Jays' facility in Dunedin, Fla. He will have an MRI exam. The move is retroactive to June 6 so Sanchez is eligible to return June 21, the next time his spot in the rotation comes up.
Sanchez, 22, is 5-4 with a 3.55 ERA in his first 11 big league starts. He made his debut last season.
Miami Marlins right-hander Jose Fernandez says his target date to rejoin the rotation is July 2, about 13 1/2 months after he underwent elbow ligament-replacement surgery.
The Marlins conclude a homestand July 2 when they face the San Francisco Giants.