Vargas entered Sunday's game for the injured Nolan Arenado (torso) and went 1-for-2 with a solo home run in a 5-3 loss to Atlanta.
Chapman triggered a vesting option in his contract when he pitched a scoreless ninth inning in Saturday's 4-0 win over the Pirates.
Story (sports hernia) started at shortstop and went 1-for-2 with a run scored for Triple-A Worcester on Sunday.
Gonzales was promoted to Double-A Portland on Sunday, Ari Alexander of 7 News Boston reports.
Bello is expected to pitch in bulk relief behind left-hander Alec Gamboa in Monday's game against the Diamondbacks at Fenway Park, Chris Cotillo of MassLive.com reports.
Gamboa will operate as Boston's opening pitcher Monday against the Diamondbacks, Gabrielle Starr of the Boston Herald reports.
Soroka didn't factor into the decision Sunday against Atlanta, allowing two runs on six hits and a walk over 5.2 innings. He struck out five.
Sandoval (1-2) took the loss Sunday against the Pirates, allowing seven runs on nine hits and three walks over four innings. He struck out six.
Gamboa will operate as Boston's opening pitcher Monday against the Diamondbacks, Gabrielle Starr of the Boston Herald reports.
Arenado (trunk) said after Sunday's 5-3 loss to Atlanta that he will undergo an MRI on Monday, Jody Jackson of DBacks.tv reports.
