According to Bill Brink from the Post-Gazette, the Pittsburgh Pirates have asked about Oakland A's infielder/outfielder Ben Zobrist, Arizona Diamondbacks infielder Cliff Pennington and San Diego Padres infielder Clint Barmes.
Pennington has mostly played shortstop during his career, but he can also play second and third base. He is hitting .245/.322/.292 in 61 games, mostly off the bench. He hits free agency at the end of the season, and combined with his offensive stats and remaining salary, the price to acquire him should be rather low.
Clint Barmes is having a strong season as a part-time player for the Padres.