GREEN BAY, Wis. - Undrafted rookie Joe Callahan, a Holy Spirit High School graduate, is coming off an impressive pro debut as the Green Bay Packers prepare to host the Oakland Raiders in a preseason game Thursday.

On Friday, Callahan threw a touchdown pass as a fill-in for star quarterback Aaron Rodgers in the Packers' 17-11 win over the Cleveland Browns at Lambeau Field in Green Bay, Wisconsin.

WATCH Joe Callahan discuss his NFL debut

WATCH Joe Callahan throw TD pass for Packers

"We had a good drive for the end of the first half, so I think things went well for my first preseason game," Callahan on his performance as the starting quarterback.

Coach Mike McCarthy decided to rest the 32-year-old Rodgers even after the Packers' matchup with the Indianapolis Colts in the Aug. 7 Hall of Fame game was canceled because of poor field conditions.

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Holy Spirit grad Joe Callahan named Division III's top football player

If it wasn’t for his grandfather, Joe Callahan wouldn’t care too much about his statistics.

The Packers also were without Rodgers' top backup, second-year QB Brett Hundley, who suffered an ankle injury in practice.

Callahan, last year's top college player in NCAA Division III for Wesley College in Dover, Delaware, was denied an opportunity to start opposite the Colts' Andrew Luck in Canton, Ohio, the previous week.

On Friday, he ran Green Bay's offense the entire first half.

He went 16 of 23 for 124 yards, throwing a 2-yard touchdown pass to running back John Crockett with 7 seconds left in the half to put the Packers ahead 10-5.

For Wesley last season, he threw for a Division III-record 5,063 yards and 55 TDs.