It's the Rangers' desire to see if Arias can be more than a middle infielder. He hasn't made an error yet at first. He was a part of three double plays on Monday.
"We're looking at him to see what he can do," Washington said.
Arias can better his chances of staying with the Rangers when he is healthy if he can also play first base, possibly moving out Ryan Garko, who has just two hits in 27 at-bats this season. Arias was batting .321 when he went on the DL. He was 0-for-4 in Tuesday's game and he is batting .200 during his rehab stint.
Arias came up through the Minor Leagues as a shortstop. He played 13 games at second base before being shelved, retroactive to April 30, with a lower back strain.
Arias worked with infield coach Dave Anderson during early batting practice while the club was in Oakland last week.