What to do with Jose Iglesias once Will Middlebrooks returns to action as soon as this Saturday is turning into a critically important piece of detective work.

Iglesias has played a new position, third base, nearly flawlessly, plus he has hit at a .424 clip, with a .444 on-base percentage .606 slugging percentage in 10 games since being recalled from Triple-A Pawtucket. While nobody expects Iglesias to maintain such a productive offensive pace, the fact that the shortstop prospect has put up numbers to match both his confidence and defense is a good sign.

“I think he’s done a very good job playing third base; he’s adjusted very quickly,” general manager Ben Cherington said.

Still, the team is still wrestling with what to do when Middlebrooks, who is expected to begin a rehab stint with Pawtucket today as he works on a return from a back injury, is activated from the disabled list.

Iglesias has had more than 900 career plate appearances at the Triple-A level, with .244/.296/.292 results. While Middlebrooks readies for his return, the Sox will be weighing the value of Iglesias getting more at-bats in the minors against hitting sporadically as a bench player in the majors.

Another option for keeping Iglesias around would be for the club to designate utility player Pedro Ciriaco for assignment. While Ciriaco, who most certainly would be claimed on waivers by another team, played better overall last season, he still holds value for his versatility.

Stephen Drew will remain the everyday shortstop.

Before Sunday night’s game, Iglesias was in the dark about his short-term future.