Bell was hitting .244 with 11 homers and 61 RBIs.
"We'll give Barker a couple of games and hit him in the two spot and see if we can get some energy at the spot," Dierker said. "We know he can play defense and run the bases. We need to find out if he can get on base."
Barker, the Astros' fastest runner, has played in 60 games and is hitting .333 with six RBIs and 13 steals.
Russ Johnson was recalled from Class Triple-A New Orleans to take Bell's roster spot.
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