SAN FRANCISCO -- The A's welcomed back left-hander Drew Pomeranz to on-field activities during their two-game visit to San Francisco, but Oakland manager Bob Melvin was not able to say exactly how the hard-throwing pitcher would utilized upon completing his rehabilitation from a broken right hand.

Pomeranz took part in fielding drills with A's pitchers before Wednesday's game at AT&T Park, the first time he did so since injuring his non-pitching hand on June 16. He only recently was cleared to as much as catch a baseball with a glove on his injured hand.

Because Pomeranz has been able to throw regularly during his stint on the DL, the A's are unlikely to send him on an injury-rehab assignment once he is cleared to be activated. The team expects him to return shortly after the All-Star break.

Pomeranz was last seen starting for the A's. He joined the rotation on May 7, going 4-1 in five May starts and then 0-2 in three June starts.

His most recent appearance -- the one that prompted him to punch a chair and break his hand -- was his worst. He allowed eight runs on eight hits in 3 2/3 innings in a 14-8 home loss to Texas on June 16.

In the meantime, the A's added two starting pitchers -- Jeff Samardzija and Jason Hammel -- in a trade with the Chicago Cubs. Pomeranz's spot in the rotation appears to have disappeared.

Melvin noted Pomeranz could return as a reliever, but the A's already employ three lefties in the bullpen -- Eric O'Flaherty, Fernando Abad and Sean Doolittle.