The Rays have extended Isaac an invitation to big-league camp during spring training, Marc Topkin of the Tampa Bay Times reports.
Isaac has been promoted from High-A Bowling Green to Double-A Montgomery, Sam Dykstra of MiLB.com reports.
Isaac (undisclosed) has started in two of High-A Bowling Green's last three games against Asheville, going 0-for-8 with a walk and an RBI.
Isaac has not played in a game for High-A Bowling Green since June 13 due to an undisclosed injury.
Isaac is slashing .257/.350/.495 with six home runs, five steals and a 27.4 percent strikeout rate through 28 games for High-A Bowling Green.