Farquhar gave up two runs on two hits in two-thirds of an inning of relief in Sunday's 13-0 loss to the Astros, allowing a run-scoring double by Hank Conger and a two-run homer to Luis Valbuena after inheriting two baserunners from starter Roenis Elias in the fourth inning.
• Elias yet another starter to endure rough outing
Farquhar had pitched two scoreless innings with no hits and two walks in Saturday's 8-1 win after being recalled from Tacoma to bolster a bullpen that has been heavily used in recent days.
The 28-year-old is 0-3 with a 6.49 ERA in 26 1/3 innings over 22 appearances with Seattle this season after going 3-1 with a 2.66 ERA in 66 games in 2014.
Manager Lloyd McClendon said the corresponding move wouldn't be made until Monday, with the likelihood being that a position player would be added. The Mariners temporarily went with an eight-man bullpen after designating utility man Rickie Weeks for assignment on Saturday in order to add Farquhar.
With Mark Trumbo sidelined Sunday by back spasms, the chances increased that an outfielder will be added. James Jones, who hit .250 with 27 stolen bases in 108 games as a rookie last year and is batting .264 with 15 stolen bases in 48 games for Tacoma, is one candidate. Veteran Franklin Gutierrez has also hit well this season for Tacoma, though he continues to battle health issues.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB, read his Mariners Musings blog, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.