Castonzo thought the worst with his knee

INDIANAPOLIS -- Indianapolis Colts left tackle Anthony Castonzo couldn’t help but to think the worse. It’s only natural when you go down with an injury.

That’s what Castonzo thought about when he went down with a right knee injury on the Colts’ first drive of the game against Cleveland over the weekend.

“When it happened, you kind of get rolled up on, you start thinking about all the hard work you put in the offseason and to get that news that it’s only going to be a short-term thing was very good,” Castonzo said Monday.

The MRI done on Castonzo’s knee revealed a sprain of the medial collateral ligament. He believes he’ll be ready for the season opener against Oakland at Lucas Oil Stadium on Sept. 8.

“Kind of just taking it day-by-day,” said Castonzo, who is responsible for protecting quarterback Andrew Luck's blindside. “Hoping that yeah, that will be plenty (of time). My goal is to be ready for Oakland.”

Joe Reitz is working with the first unit at left tackle while Castonzo is out.