ANAHEIM -- Angels right fielder and leadoff man Kole Calhoun twisted his right ankle after crossing first base on an 11th-inning groundout on Tuesday night and is headed to the 15-day disabled list, where he'll join cleanup-hitting left fielder Josh Hamilton.

Leading off the bottom of the 11th of an eventual 10-9 loss to the A's, Calhoun hit a grounder to second base and crossed first base just fine. But he caught his right foot on a soft spot just beyond the bag, and had to be helped off the field.

"I just rolled it and it hurt real bad," said Calhoun, who was on crutches postgame. "It's just a freak thing, you know?"

Calhoun went 3-for-6 with a two-run homer and a key ninth-inning double as the Angels suffered back-to-back losses to their division rivals. He went 7-for-15 in his last three games.

In Triple-A Salt Lake, the Angels have left-handed-hitting outfielders Matt Long (.270 batting average) and Brennan Boesch (.250) they can call up. Each would have to be added to the 40-man roster, which is currently full. The Angels also could try to acquire versatile outfielder Sam Fuld, who was designated for assignment by the A's on Saturday.

Asked about Angels manager Mike Scioscia saying he'll be going on the DL, Calhoun said: "It's disappointing. Nothing's solidified right now, but we'll see what happens."