Two Phillies catchers hopped planes in opposite directions Sunday morning, the latest development at a position ravaged by injury.

Erik Kratz was placed on the disabled list and flew to Philadelphia for an MRI exam on his left knee. Steven Lerud caught a 7 a.m. flight and arrived at Milwaukee's Miller Park to serve as Humberto Quintero's backup for the foreseeable future.

The Phillies are without their top catchers, Carlos Ruiz and Kratz, for at least the next week.

It is an undesirable situation. The extent of Kratz's injury will not be known until Monday, when he undergoes an examination. The initial prognosis was not favorable. Kratz was on crutches Saturday night after he felt a "pop" in his knee while he ran past first base in the ninth inning of a 4-3 loss.

Kratz, who ranks second on the team with eight homers, had flourished since Ruiz succumbed to a hamstring injury May 19. During that span, Kratz hit .267 with a .964 OPS. He hit six homers in 18 games. Saturday's 0 for 4 snapped a seven-game RBI streak.

There is no timetable for Ruiz's return. Ruiz said he suffered what was considered a minor setback and he was originally slotted to miss a month when he was put on the DL. He may start a minor-league rehab assignment at triple-A Lehigh Valley on Friday if he passes more tests in Minnesota during the week. The Phillies must scrape by with their third- and fourth-string catchers for some time.

Quintero homered Sunday for the Phillies' lone run in a 9-1 loss.

Lerud, 28, earned a brief major-league stint at the end of 2012. He was hitting .221 in 31 games for the IronPigs. The Phillies like his defensive capabilities. Because prospect Tommy Joseph missed the last month with a concussion and just recently returned to the field, he was not an option.

"Here I am," Lerud said.

The Phillies relayed news of his recall before midnight Sunday. An IronPigs intern drove Lerud from Allentown to Philadelphia at 4 a.m. so he could catch his flight. He arrived in the visiting clubhouse shortly after 10 a.m.

"Will you be ready to catch a bullpen in 10 minutes?" Cole Hamels quipped.

"Yeah," Lerud said, as he sipped a cup of coffee, likely one of many he'd have on Sunday. And thus began the Phillies' makeshift solution behind the plate.