"The jury's still out, so to speak," Sveum said Monday. "We have quite a few games left to evaluate both of them and the game calling."
The Cubs opted to trade Geovany Soto to the Rangers in July and go with the two young catchers. Castillo entered Monday's game against the Brewers batting .275, while Clevenger was hitting .222. Castillo has thrown out four of 19 attempted basestealers, while Clevenger has thrown out four of 36.
"We obviously know with Castillo, the bottom line is he's one of the better throwers in the game already," Sveum said. "The other parts of the game [are what] he has to improve on and get better on, as well as swinging the bat. He's got the ability to be a prolific hitting catcher."
Castillo has been bothered by some soreness on the outside of his foot, which might have been caused by new shoes. He was in the lineup on Monday.