PHILADELPHIA --- Phillies third baseman Placido Polanco was not in the lineup for Sunday's series finale against the Red Sox with a mild sprain in his left ankle. It's the fourth straight game Polanco has not started, though he could pinch-hit.

Ty Wigginton was slotted as the Phils' starting third baseman Sunday.

It was previously believed that Polanco's injury was a sore left knee, but the veteran third baseman said before Sunday's game that it was actually his ankle that was sore. He hopes to play Monday against the Nationals. He pinch-hit in Saturday's 7-5 loss to Boston.

"When I run, I feel it. It's sore," Polanco said. "But it's getting better. It's getting better, and it's a day-to-day thing."

Polanco said he's "almost 100 percent sure" the injury stems from one of the foul balls he recently hit off his ankle. He left Wednesday's game in Chicago in the seventh inning after fouling off a ball.

Polanco, who last week recorded his 2,000th career hit, is hitting .279 with eight RBIs this season.

Worley to work through bone chip in elbow

PHILADELPHIA -- Phillies right-hander Vance Worley said before Sunday's game against the Red Sox that he should start throwing again in the next few days.

"We'll see where that takes us," Worley said.

Worley was placed on the 15-day disabled list Wednesday with right elbow inflammation, though Phillies general manager Ruben Amaro Jr. said that day that there was no structural damage in the elbow.

On Sunday, Worley could not offer a timetable for his return, but admitted he also had a bone chip in his elbow that he will have to work through. Worley said he hopes that the rest brings down the elbow inflammation, and in the meantime, he's been doing a lot of running.

"It's just right where we want to be, I guess," Worley said of his rehab. "I'm not throwing for another couple days. Just kind of taking it day by day right now."

Before going on the disabled list, Worley was 3-2 with a 3.07 ERA in seven starts. Kyle Kendrick has taken his spot in the rotation.

Worth noting

• Phillies left-hander Cliff Lee was still in search of his first win of 2012 entering Sunday's start against the Red Sox. Five starts is the longest Lee (0-1, 1.95 ERA) has gone winless to start a season in his career.

• With a win Sunday, the Phillies would win their fourth series in a row.

• Josh Beckett, who started Sunday for Boston, has hit two of his three career home runs against the Phillies at Citizens Bank Park. On the mound, he's 8-5 with a 4.18 ERA in 20 games (18 starts) against Philadelphia.