The most significant injury belongs to Cabrera, who needed to be helped off the field after straining the patella tendon in his left knee Sunday. But the Mets are optimistic that Cabrera's injury is no more serious than when he suffered a similar one during Spring Training, missing two weeks. If that's the case, he could come off the DL as soon as he's eligible on Aug. 16.
"It just flared up pretty bad the other night," manager Terry Collins said.
Ruggiano's injury is a mild left hamstring strain; placing him on the DL provided an easy avenue for the Mets to make room for Bruce.
The other two roster moves were strategic. With five left-handed outfielders on their active roster, the Mets decided to option Nimmo in order to give the organization's fifth-ranked prospect more regular at-bats at Las Vegas. Part of the Mets' original trade framework for Bruce before the Mets and Reds restructured their deal around Dilson Herrera, Nimmo hit .250 with one home run in 19 games with the Mets, split between two stints.
"This isn't new," Nimmo said. "This is something that I've had experience with before, just going through ups and downs with life in general. This is something where there's just too many players. Getting Bruce is awesome for our team. However I can help the team, that's what I want to do. And right now, that's by me going down and working on my craft in Triple-A."
Replacing Nimmo is Kelly, a versatile utility man who hit .148 in 14 games for the Mets earlier this year. Though the Mets considered other options, including fan favorite T.J. Rivera, they believed Kelly was best suited to give them quality at-bats despite sporadic playing time.
Edgin, 29, returns to the Mets for the first time since undergoing Tommy John surgery in March 2015. Though he never regained his old mid-90s velocity after surgery, instead topping out at around 93 mph at Las Vegas, Edgin did post a 2.20 ERA in 31 appearances there. He will join Niese and Jerry Blevins as Collins' options against left-handed batters.
Anthony DiComo has covered the Mets for MLB.com since 2008. Follow him on Twitter @AnthonyDiComo and Facebook, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.