Groshans was traded by the Yankees to the Athletics in exchange for J.D. Davis and cash considerations.
Groshans was optioned to Triple-A Scranton/Wilkes-Barre on Sunday.
Groshans was designated for assignment by the Yankees on Wednesday.
The Yankees claimed Groshans off waivers from the Marlins on Tuesday.
The Marlins optioned Groshans (shoulder) to Triple-A Jacksonville on Sunday, Jordan McPherson of the Miami Herald reports.
Groshans (shoulder) took batting practice Tuesday morning in Marlins camp, Jordan McPherson of the Miami Herald reports.
Groshans reported improvement with his ailing left shoulder Sunday, according to MLB.com.
Groshans is dealing with a sore shoulder, Christina De Nicola of MLB.com reports.
Groshans has been getting regular work at first base during Grapefruit League games to begin spring training, improving his odds of breaking camp on the 26-man roster, Jordan McPherson of The Miami Herald reports.
Groshans is out of the lineup for Monday's game against Atlanta, Christina De Nicola of MLB.com reports.