When it comes to bargaining chips at the winter meetings, the A’s hold one potentially interesting piece. The A’s first act of the offseason was to pick up Jed Lowrie’s very reasonable $6 million option for 2018, and they had every intention of keeping him at least until the trade deadline. But with second basemen in demand this winter and Oakland on the lookout for a corner outfielder and a left-handed reliever and having Franklin Barreto available to slot in at second base, it’s increasingly apparent that Lowrie could be on the move sooner rather than later. Healthy all season for the first time since 2013, Lowrie, 33, was the A’s best all-around player in 2017, with a team-best WAR of 4.0. He also can play third base and shortstop. Among the teams looking for a second baseman: the Mets, Brewers and Angels. Milwaukee outfielder Domingo Santana certainly would be on Oakland’s wish list if available, as recent reports have suggested. Even if the Brewers have interest in Lowrie, they probably would need to get a starting pitcher, too, even to contemplate moving Santana, who hit 30 homers last season and has three years of service time remaining. The Brewers also might be hesitant to move another slugging outfielder to Oakland: they did so two years ago and since then, Khris Davis has hit 85 homers for the A’s. The Mets and Angels don’t have outfielders to spare, but if some sort of multiteam deal developed, Lowrie might pique some interest. Oakland remains interested in St. Louis outfielder Stephen Piscotty, as The Chronicle reported a week ago, though Piscotty might be a tougher get now that the Cardinals missed on Giancarlo Stanton. St. Louis is looking for relief pitching and starting pitchers, including Triple-A starters; the A’s might have enough depth in those areas to accommodate the Cards. The Cardinals rarely make deals with Oakland, but they appear to match up well in this instance. One industry source estimated there is a 50-50 chance of the deal happening before the end of the winter meetings.