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“I think it’s huge. The more confidence he gets, the better we get as an offense,” tight end Dallas Clark said. “Everyone needs to focus individually on their effort and if everyone improves collectively, then we’ll improve as an offense.”

It starts with Collins, who blamed himself for not taking care of the ball at Houston.

Collins lost the first fumble when Houston’s Antonio Smith blind-sided him. On the Colts’ next offensive play, Collins dropped the snap and Houston recovered again. The Texans quickly converted both turnovers into touchdowns, putting Indy in a quick 17-0 hole. Indy never recovered.

“I know he’ll be more comfortable and have a little better grasp of things,” Caldwell said. “There were some things he did well, but I think it’s not just him. It’s a number of guys who will show the kind of improvement we need.”

Whether it was the blocking scheme, the new offensive line, a philosophical change or not enough time to get Collins acclimated, Colts fans expect to see a better performance this week.

And Collins intends to meet those expectations in his first home game as Manning’s replacement.

“We’ll improve, we have to improve,” Collins said. “There were too many mistakes, too many turnovers. You know any kind of start would be better than what we had last week.”

Note: The Colts signed linebacker Nate Triplett to the active roster and added linebacker Caleb Campbell to the practice squad Wednesday. Indy was looking for reinforcements after defensive captain Gary Brackett (shoulder) and backup linebacker Ernie Sims (sprained knee) were ruled out of Sunday’s game by Caldwell. Triplett was a fifth-round draft pick of the Vikings in 2010. Campbell was a seventh-round pick of the Detroit Lions in 2008 and played in three games with the Lions last season.