Rivera took the roster spot of reliever Mitch Stetter, who went on the 15-day DL with left hip irritation. That move left the Brewers with no left-handers in their bullpen.
"If we had a lights-out lefty, I'd like to have one," said manager Ron Roenicke. "In Anaheim, we didn't have one for seven years. So it can be done."
General manager Doug Melvin said Stetter had been experiencing discomfort in his left hip for some time. It was beginning to affect his performance, resulting in a 5.14 ERA in 16 outings.
"It had bothered him the past few days and he tried to pitch through it," said Melvin. "It got to the point where it was hurting his effectiveness. They decided it was better to take care of it now."
Roenicke had wanted another right-handed bat on the bench since Erick Almonte went on the DL with a concussion three weeks ago. Adding Rivera didn't affect the catching situation much, but Melvin noted that Roenicke could pinch-hit for weak-hitting backup catcher Wil Nieves and have another catcher on the bench to put in the game if desired.
"We feel we have enough length in the bullpen with (middle relievers) Tim Dillard, Sergio Mitre and Marco Estrada that we can go with seven relievers and have the extra bat on the bench," said Melvin.
In 18 games at Nashville, Rivera was batting .250 with three homers and 10 RBI. There are other players doing much more offensively there, such as first baseman Mat Gamel, but they are left-handed hitters and Roenicke wanted a right-handed bat.
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