The Tigers selected Callahan's contract from Triple-A Toledo on Sunday. He'll start in left field and bat seventh in the series finale versus the White Sox.
Lopez allowed two runs on five hits and two walks while striking out six over six innings in a no-decision versus the Rangers on Sunday.
Butler went 2-for-4 with a two-run home run in Sunday's 5-2 win over the Rangers.
Bolte went 3-for-5 with a run scored in Sunday's 5-2 win over the Rangers.
Gelof went 2-for-5 with a two-run home run in Sunday's 5-2 win over the Rangers.
Harris struck out two in a perfect inning to earn the save in Sunday's 5-2 win over the Rangers.
White went 2-for-4 with a solo home run and a second run scored in Sunday's 5-2 win over the Rangers.
The Tigers announced Friday that Flaherty (forearm) has increased the intensity and distance of his throwing progression, MLB.com reports.
Walton is out of the lineup for Sunday's game against the Rangers.
The Athletics transferred Sterner (knee) from the 15-day injured list to the 60-day IL on Sunday.
A’s starter Jack Perkins was 0-3 with a 7.79 ERA in July, which was only a little worse than his 6.65 ERA in June – and slightly better than the 7.98 posted in May. The bullpen behind him has a 6.96 ERA this week. Detroit’s offense is hitting RHPs to a .912 OPS over the last two-plus weeks. So Detroit, which has scored 13, 9 and 14 runs the last three games, should score some here as well. Framber Valdez has allowed 0-2 runs in four of his last seven starts, and 4-6 in the other three. Expect the better version vs. a lineup with a subpar OPS vs. southpaws the last month.
