"He took one right off the bicep, so I didn't want to take a chance," McClendon said. "But I think he's going to be OK."
Farquhar flexed his muscle in the clubhouse as he polished off a postgame meal.
"I think I dented that ball," he said with a grin.
Farquhar had just given up the go-ahead run on a single by Carlos Santana, the first batter he faced after coming into the game in a 4-4 tie with two runners on base courtesy of fellow reliever Charlie Furbush. But Seattle came back to win the game on a Mike Zunino homer in the eighth.
Farquhar was 1-1 with a 2.68 ERA in 44 appearances.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.