"There is a little bit of a challenge bringing him in here with our situation with a need for innings right away with his inactivity," Farrell said. "We'll see what he has."
After a successful season with the Giants in 2014, Machi's numbers fell off this season, leading to his release. He pitched in 71 games for San Francisco in '14, tossing 66 1/3 innings with a 2.58 ERA. In 33 games for the club this season, he had a 5.14 ERA in 35 innings.
Farrell believes Machi's success will hinge on how effectively the right-hander uses his slider.
"His fastball velocity has been consistently between 92 to 94 mph. His damage has come with his slider," Farrell said. "It hasn't been as sharp as it was the last two years. That's the pitch that we have to hone in on and regain that consistency."
While Machi's thrown fewer splitters this season, the right-hander believes he needs to feature the pitch more.
"It has been about mechanics. Little by little, I've been working and am past that," Machi said through translator Adrian Lorenzo. "I hope we are moving in the right direction."
Quinn Roberts is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.