Justin Masterson revealed Wednesday that the right knee issue that will force him to miss his start Sunday has been a problem since his second outing of the season. It could help explain why Masterson's velocity has been down and his ERA is up to 5.03. "I don't know," said Masterson. "It's just been a little nagging. Maybe it's taken (away) a little of the power and consistency?" The Indians might be best off shutting Masterson down for a while, but the hope is that he'll feel well enough to start Tuesday or Wednesday. T.J. House is likely to be called up to start Sunday.