Rios, whom the Dodgers selected in the fifth round of the 2015 Draft out of Florida International University, hit .249/.308/.475 with with 14 home runs in 70 games for Oklahoma City this season. Ranked as the club's No. 12 prospect, he has been particularly hot since May 29, slashing .316/.380/.653 with nine homers.
Rios, who made his Major League debut as a pinch-hitter and grounded to first in the seventh inning of Thursday's 12-8 victory, also gives the Dodgers even more defensive flexibility, as he is able to play both corner-infield positions, as well as left field.
"For Edwin, this month of June has been very productive, and looking out as far as this series and Arizona next week, a bunch of right-handers [on the mound], so to potentially get him some at-bats, and tonight we were short on the bench and that'll free us up a little bit," manager Dave Roberts said Thursday.
Rosscup was selected off waivers by the Blue Jays last month. He made two appearances for Toronto, allowing three runs over two innings, after he posted a 3.21 ERA in 19 appearances for the Mariners. Rosscup signed with the Dodgers on June 12 after being granted free agency. The club is familiar with him, as he posted a 4.76 ERA over 17 appearances for Los Angeles last year.
He entered Thursday's win over the Rockies in the sixth inning to relieve Walker Buehler, walking one and striking out one in one-third of an inning.
Gonsolin made his Major League debut in Wednesday's 8-2 loss to the D-backs in Arizona. He was called up to make a start in order to give the other five starters in the rotation an extra day of rest. He gave up six runs (four earned) over four innings.
Ferguson had a 0.87 ERA over nine appearances through April 18, but has struggled since then with a 9.24 ERA 13 outings.
Pollock is hoping to return to the lineup following the All-Star break. In 115 plate appearances before having to undergo surgery on his infected elbow, he hit .223/.287/.330 with two home runs.